diff --git a/engine/src/flutter/impeller/aiks/aiks_context.h b/engine/src/flutter/impeller/aiks/aiks_context.h
index 5ac0fcaa7b..650465d770 100644
--- a/engine/src/flutter/impeller/aiks/aiks_context.h
+++ b/engine/src/flutter/impeller/aiks/aiks_context.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_AIKS_CONTEXT_H_
+#define FLUTTER_IMPELLER_AIKS_AIKS_CONTEXT_H_
 
 #include <memory>
 
@@ -51,3 +52,5 @@ class AiksContext {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_AIKS_CONTEXT_H_
diff --git a/engine/src/flutter/impeller/aiks/aiks_playground.h b/engine/src/flutter/impeller/aiks/aiks_playground.h
index a98c426e78..64490cb679 100644
--- a/engine/src/flutter/impeller/aiks/aiks_playground.h
+++ b/engine/src/flutter/impeller/aiks/aiks_playground.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_AIKS_PLAYGROUND_H_
+#define FLUTTER_IMPELLER_AIKS_AIKS_PLAYGROUND_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/aiks/aiks_context.h"
@@ -41,3 +42,5 @@ class AiksPlayground : public PlaygroundTest {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_AIKS_PLAYGROUND_H_
diff --git a/engine/src/flutter/impeller/aiks/canvas.h b/engine/src/flutter/impeller/aiks/canvas.h
index b1c6bab073..df62c29bcf 100644
--- a/engine/src/flutter/impeller/aiks/canvas.h
+++ b/engine/src/flutter/impeller/aiks/canvas.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_CANVAS_H_
+#define FLUTTER_IMPELLER_AIKS_CANVAS_H_
 
 #include <deque>
 #include <functional>
@@ -198,3 +199,5 @@ class Canvas {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_CANVAS_H_
diff --git a/engine/src/flutter/impeller/aiks/canvas_recorder.h b/engine/src/flutter/impeller/aiks/canvas_recorder.h
index 2a07a371ce..4b75ef5f82 100644
--- a/engine/src/flutter/impeller/aiks/canvas_recorder.h
+++ b/engine/src/flutter/impeller/aiks/canvas_recorder.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_CANVAS_RECORDER_H_
+#define FLUTTER_IMPELLER_AIKS_CANVAS_RECORDER_H_
 
 #include <cstdint>
 
@@ -303,3 +304,5 @@ class CanvasRecorder {
 #endif
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_CANVAS_RECORDER_H_
diff --git a/engine/src/flutter/impeller/aiks/canvas_type.h b/engine/src/flutter/impeller/aiks/canvas_type.h
index a6992163a7..c9402c0526 100644
--- a/engine/src/flutter/impeller/aiks/canvas_type.h
+++ b/engine/src/flutter/impeller/aiks/canvas_type.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_CANVAS_TYPE_H_
+#define FLUTTER_IMPELLER_AIKS_CANVAS_TYPE_H_
 
 #include "impeller/aiks/canvas.h"
 #include "impeller/aiks/canvas_recorder.h"
@@ -20,3 +21,5 @@ using CanvasType = Canvas;
 #endif
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_CANVAS_TYPE_H_
diff --git a/engine/src/flutter/impeller/aiks/color_filter.h b/engine/src/flutter/impeller/aiks/color_filter.h
index 84dfbbd19b..4ed24b81b1 100644
--- a/engine/src/flutter/impeller/aiks/color_filter.h
+++ b/engine/src/flutter/impeller/aiks/color_filter.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_COLOR_FILTER_H_
+#define FLUTTER_IMPELLER_AIKS_COLOR_FILTER_H_
 
 #include "impeller/entity/contents/filters/color_filter_contents.h"
 #include "impeller/geometry/color.h"
@@ -176,3 +177,5 @@ class ComposedColorFilter final : public ColorFilter {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_COLOR_FILTER_H_
diff --git a/engine/src/flutter/impeller/aiks/color_source.h b/engine/src/flutter/impeller/aiks/color_source.h
index 7849b841ec..868362d99c 100644
--- a/engine/src/flutter/impeller/aiks/color_source.h
+++ b/engine/src/flutter/impeller/aiks/color_source.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_COLOR_SOURCE_H_
+#define FLUTTER_IMPELLER_AIKS_COLOR_SOURCE_H_
 
 #include <functional>
 #include <memory>
@@ -103,3 +104,5 @@ class ColorSource {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_COLOR_SOURCE_H_
diff --git a/engine/src/flutter/impeller/aiks/image.h b/engine/src/flutter/impeller/aiks/image.h
index 4011137b40..534506880b 100644
--- a/engine/src/flutter/impeller/aiks/image.h
+++ b/engine/src/flutter/impeller/aiks/image.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_IMAGE_H_
+#define FLUTTER_IMPELLER_AIKS_IMAGE_H_
 
 #include <memory>
 
@@ -30,3 +31,5 @@ class Image {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_IMAGE_H_
diff --git a/engine/src/flutter/impeller/aiks/image_filter.h b/engine/src/flutter/impeller/aiks/image_filter.h
index e3e6908df5..9d72c14d1a 100644
--- a/engine/src/flutter/impeller/aiks/image_filter.h
+++ b/engine/src/flutter/impeller/aiks/image_filter.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_IMAGE_FILTER_H_
+#define FLUTTER_IMPELLER_AIKS_IMAGE_FILTER_H_
 
 #include "impeller/aiks/color_filter.h"
 #include "impeller/core/sampler_descriptor.h"
@@ -271,3 +272,5 @@ class LocalMatrixImageFilter : public ImageFilter {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_IMAGE_FILTER_H_
diff --git a/engine/src/flutter/impeller/aiks/paint.h b/engine/src/flutter/impeller/aiks/paint.h
index 68608d3dce..126f152dba 100644
--- a/engine/src/flutter/impeller/aiks/paint.h
+++ b/engine/src/flutter/impeller/aiks/paint.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_PAINT_H_
+#define FLUTTER_IMPELLER_AIKS_PAINT_H_
 
 #include <memory>
 
@@ -106,3 +107,5 @@ struct Paint {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_PAINT_H_
diff --git a/engine/src/flutter/impeller/aiks/paint_pass_delegate.h b/engine/src/flutter/impeller/aiks/paint_pass_delegate.h
index c0154475ae..6209f56bcd 100644
--- a/engine/src/flutter/impeller/aiks/paint_pass_delegate.h
+++ b/engine/src/flutter/impeller/aiks/paint_pass_delegate.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_PAINT_PASS_DELEGATE_H_
+#define FLUTTER_IMPELLER_AIKS_PAINT_PASS_DELEGATE_H_
 
 #include <optional>
 
@@ -81,3 +82,5 @@ class OpacityPeepholePassDelegate final : public EntityPassDelegate {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_PAINT_PASS_DELEGATE_H_
diff --git a/engine/src/flutter/impeller/aiks/picture.h b/engine/src/flutter/impeller/aiks/picture.h
index f4e8a640ef..8419d203e9 100644
--- a/engine/src/flutter/impeller/aiks/picture.h
+++ b/engine/src/flutter/impeller/aiks/picture.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_PICTURE_H_
+#define FLUTTER_IMPELLER_AIKS_PICTURE_H_
 
 #include <deque>
 #include <memory>
@@ -31,3 +32,5 @@ struct Picture {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_PICTURE_H_
diff --git a/engine/src/flutter/impeller/aiks/picture_recorder.h b/engine/src/flutter/impeller/aiks/picture_recorder.h
index 739792a2df..ab561d437e 100644
--- a/engine/src/flutter/impeller/aiks/picture_recorder.h
+++ b/engine/src/flutter/impeller/aiks/picture_recorder.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_PICTURE_RECORDER_H_
+#define FLUTTER_IMPELLER_AIKS_PICTURE_RECORDER_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/aiks/canvas.h"
@@ -25,3 +26,5 @@ class PictureRecorder {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_PICTURE_RECORDER_H_
diff --git a/engine/src/flutter/impeller/aiks/testing/context_mock.h b/engine/src/flutter/impeller/aiks/testing/context_mock.h
index c80ade623d..b2d9138503 100644
--- a/engine/src/flutter/impeller/aiks/testing/context_mock.h
+++ b/engine/src/flutter/impeller/aiks/testing/context_mock.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_TESTING_CONTEXT_MOCK_H_
+#define FLUTTER_IMPELLER_AIKS_TESTING_CONTEXT_MOCK_H_
 
 #include <string>
 #include <utility>
@@ -115,3 +116,5 @@ class ContextMock : public Context {
 
 }  // namespace testing
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_TESTING_CONTEXT_MOCK_H_
diff --git a/engine/src/flutter/impeller/aiks/testing/context_spy.h b/engine/src/flutter/impeller/aiks/testing/context_spy.h
index 9d32f2e136..28a5ec3907 100644
--- a/engine/src/flutter/impeller/aiks/testing/context_spy.h
+++ b/engine/src/flutter/impeller/aiks/testing/context_spy.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_TESTING_CONTEXT_SPY_H_
+#define FLUTTER_IMPELLER_AIKS_TESTING_CONTEXT_SPY_H_
 
 #include <memory>
 #include "impeller/aiks/testing/context_mock.h"
@@ -28,3 +29,5 @@ class ContextSpy : public std::enable_shared_from_this<ContextSpy> {
 }  // namespace testing
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_TESTING_CONTEXT_SPY_H_
diff --git a/engine/src/flutter/impeller/aiks/trace_serializer.h b/engine/src/flutter/impeller/aiks/trace_serializer.h
index 9232de504a..bb6598a50f 100644
--- a/engine/src/flutter/impeller/aiks/trace_serializer.h
+++ b/engine/src/flutter/impeller/aiks/trace_serializer.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_AIKS_TRACE_SERIALIZER_H_
+#define FLUTTER_IMPELLER_AIKS_TRACE_SERIALIZER_H_
 
 #include <iostream>
 #include "impeller/aiks/canvas_recorder.h"
@@ -62,3 +63,5 @@ class TraceSerializer {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_AIKS_TRACE_SERIALIZER_H_
diff --git a/engine/src/flutter/impeller/archivist/archivable.h b/engine/src/flutter/impeller/archivist/archivable.h
index 41c296301d..9a7bdba6d2 100644
--- a/engine/src/flutter/impeller/archivist/archivable.h
+++ b/engine/src/flutter/impeller/archivist/archivable.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ARCHIVIST_ARCHIVABLE_H_
+#define FLUTTER_IMPELLER_ARCHIVIST_ARCHIVABLE_H_
 
 #include <cstdint>
 #include <optional>
@@ -36,3 +37,5 @@ class Archivable {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ARCHIVIST_ARCHIVABLE_H_
diff --git a/engine/src/flutter/impeller/archivist/archive.h b/engine/src/flutter/impeller/archivist/archive.h
index 33c3f66988..753e60beb1 100644
--- a/engine/src/flutter/impeller/archivist/archive.h
+++ b/engine/src/flutter/impeller/archivist/archive.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_H_
+#define FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_H_
 
 #include <functional>
 #include <memory>
@@ -72,3 +73,5 @@ class Archive {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_H_
diff --git a/engine/src/flutter/impeller/archivist/archive_class_registration.h b/engine/src/flutter/impeller/archivist/archive_class_registration.h
index 6fc5710427..7de79d35d5 100644
--- a/engine/src/flutter/impeller/archivist/archive_class_registration.h
+++ b/engine/src/flutter/impeller/archivist/archive_class_registration.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_CLASS_REGISTRATION_H_
+#define FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_CLASS_REGISTRATION_H_
 
 #include <map>
 #include <optional>
@@ -49,3 +50,5 @@ class ArchiveClassRegistration {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_CLASS_REGISTRATION_H_
diff --git a/engine/src/flutter/impeller/archivist/archive_database.h b/engine/src/flutter/impeller/archivist/archive_database.h
index e8376fc370..c3f85196da 100644
--- a/engine/src/flutter/impeller/archivist/archive_database.h
+++ b/engine/src/flutter/impeller/archivist/archive_database.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_DATABASE_H_
+#define FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_DATABASE_H_
 
 #include <map>
 #include <memory>
@@ -53,3 +54,5 @@ class ArchiveDatabase {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_DATABASE_H_
diff --git a/engine/src/flutter/impeller/archivist/archive_location.h b/engine/src/flutter/impeller/archivist/archive_location.h
index 6b773274ad..9df52ab400 100644
--- a/engine/src/flutter/impeller/archivist/archive_location.h
+++ b/engine/src/flutter/impeller/archivist/archive_location.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_LOCATION_H_
+#define FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_LOCATION_H_
 
 #include <optional>
 #include <type_traits>
@@ -171,3 +172,5 @@ class ArchiveLocation {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_LOCATION_H_
diff --git a/engine/src/flutter/impeller/archivist/archive_statement.h b/engine/src/flutter/impeller/archivist/archive_statement.h
index a5de60f865..09e002afe7 100644
--- a/engine/src/flutter/impeller/archivist/archive_statement.h
+++ b/engine/src/flutter/impeller/archivist/archive_statement.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_STATEMENT_H_
+#define FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_STATEMENT_H_
 
 #include <memory>
 #include <type_traits>
@@ -95,3 +96,5 @@ class ArchiveStatement {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_STATEMENT_H_
diff --git a/engine/src/flutter/impeller/archivist/archive_transaction.h b/engine/src/flutter/impeller/archivist/archive_transaction.h
index 671074cb15..1b95b37721 100644
--- a/engine/src/flutter/impeller/archivist/archive_transaction.h
+++ b/engine/src/flutter/impeller/archivist/archive_transaction.h
@@ -1,7 +1,8 @@
 // Copyright 2013 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-#pragma once
+#ifndef FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_TRANSACTION_H_
+#define FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_TRANSACTION_H_
 
 #include <cstdint>
 
@@ -47,3 +48,5 @@ class ArchiveTransaction {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_TRANSACTION_H_
diff --git a/engine/src/flutter/impeller/archivist/archive_vector.h b/engine/src/flutter/impeller/archivist/archive_vector.h
index 2db657a683..34600cee92 100644
--- a/engine/src/flutter/impeller/archivist/archive_vector.h
+++ b/engine/src/flutter/impeller/archivist/archive_vector.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_VECTOR_H_
+#define FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_VECTOR_H_
 
 #include "impeller/archivist/archive.h"
 
@@ -35,3 +36,5 @@ class ArchiveVector : public Archivable {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_VECTOR_H_
diff --git a/engine/src/flutter/impeller/archivist/archivist_fixture.h b/engine/src/flutter/impeller/archivist/archivist_fixture.h
index b31abd3eec..fa90d0bdff 100644
--- a/engine/src/flutter/impeller/archivist/archivist_fixture.h
+++ b/engine/src/flutter/impeller/archivist/archivist_fixture.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ARCHIVIST_ARCHIVIST_FIXTURE_H_
+#define FLUTTER_IMPELLER_ARCHIVIST_ARCHIVIST_FIXTURE_H_
 
 #include "flutter/fml/macros.h"
 #include "flutter/testing/testing.h"
@@ -36,3 +37,5 @@ class ArchivistFixture : public ::testing::Test {
 
 }  // namespace testing
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ARCHIVIST_ARCHIVIST_FIXTURE_H_
diff --git a/engine/src/flutter/impeller/base/allocation.h b/engine/src/flutter/impeller/base/allocation.h
index a32d97bc0f..dd1b06befa 100644
--- a/engine/src/flutter/impeller/base/allocation.h
+++ b/engine/src/flutter/impeller/base/allocation.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_BASE_ALLOCATION_H_
+#define FLUTTER_IMPELLER_BASE_ALLOCATION_H_
 
 #include <cstdint>
 #include <limits>
@@ -54,3 +55,5 @@ std::shared_ptr<fml::Mapping> CreateMappingWithString(
 std::shared_ptr<fml::Mapping> CreateMappingWithString(std::string string);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_BASE_ALLOCATION_H_
diff --git a/engine/src/flutter/impeller/base/backend_cast.h b/engine/src/flutter/impeller/base/backend_cast.h
index c3044bb2ac..71e2331cd4 100644
--- a/engine/src/flutter/impeller/base/backend_cast.h
+++ b/engine/src/flutter/impeller/base/backend_cast.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_BASE_BACKEND_CAST_H_
+#define FLUTTER_IMPELLER_BASE_BACKEND_CAST_H_
 
 #include "flutter/fml/macros.h"
 
@@ -25,3 +26,5 @@ class BackendCast {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_BASE_BACKEND_CAST_H_
diff --git a/engine/src/flutter/impeller/base/comparable.h b/engine/src/flutter/impeller/base/comparable.h
index 08780f75c5..2f0c6e1e65 100644
--- a/engine/src/flutter/impeller/base/comparable.h
+++ b/engine/src/flutter/impeller/base/comparable.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_BASE_COMPARABLE_H_
+#define FLUTTER_IMPELLER_BASE_COMPARABLE_H_
 
 #include <cstddef>
 #include <functional>
@@ -109,3 +110,5 @@ struct less<impeller::UniqueID> {
 };
 
 }  // namespace std
+
+#endif  // FLUTTER_IMPELLER_BASE_COMPARABLE_H_
diff --git a/engine/src/flutter/impeller/base/config.h b/engine/src/flutter/impeller/base/config.h
index 610661a48d..06c9186940 100644
--- a/engine/src/flutter/impeller/base/config.h
+++ b/engine/src/flutter/impeller/base/config.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_BASE_CONFIG_H_
+#define FLUTTER_IMPELLER_BASE_CONFIG_H_
 
 #include <cstdlib>
 
@@ -35,3 +36,5 @@ namespace impeller {
 }
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_BASE_CONFIG_H_
diff --git a/engine/src/flutter/impeller/base/promise.h b/engine/src/flutter/impeller/base/promise.h
index 04b0cc962b..30d45ae4d3 100644
--- a/engine/src/flutter/impeller/base/promise.h
+++ b/engine/src/flutter/impeller/base/promise.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_BASE_PROMISE_H_
+#define FLUTTER_IMPELLER_BASE_PROMISE_H_
 
 #include <future>
 
@@ -17,3 +18,5 @@ std::future<T> RealizedFuture(T t) {
 }
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_BASE_PROMISE_H_
diff --git a/engine/src/flutter/impeller/base/strings.h b/engine/src/flutter/impeller/base/strings.h
index 085bb1263d..cefe10343e 100644
--- a/engine/src/flutter/impeller/base/strings.h
+++ b/engine/src/flutter/impeller/base/strings.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_BASE_STRINGS_H_
+#define FLUTTER_IMPELLER_BASE_STRINGS_H_
 
 #include <string>
 
@@ -20,3 +21,5 @@ bool HasSuffix(const std::string& string, const std::string& suffix);
 std::string StripPrefix(const std::string& string, const std::string& to_strip);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_BASE_STRINGS_H_
diff --git a/engine/src/flutter/impeller/base/thread.h b/engine/src/flutter/impeller/base/thread.h
index d6b03573a2..c9f3fcb245 100644
--- a/engine/src/flutter/impeller/base/thread.h
+++ b/engine/src/flutter/impeller/base/thread.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_BASE_THREAD_H_
+#define FLUTTER_IMPELLER_BASE_THREAD_H_
 
 #include <chrono>
 #include <condition_variable>
@@ -268,3 +269,5 @@ class ConditionVariable {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_BASE_THREAD_H_
diff --git a/engine/src/flutter/impeller/base/thread_safety.h b/engine/src/flutter/impeller/base/thread_safety.h
index 8d1f0aa02c..da1aed3b5e 100644
--- a/engine/src/flutter/impeller/base/thread_safety.h
+++ b/engine/src/flutter/impeller/base/thread_safety.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_BASE_THREAD_SAFETY_H_
+#define FLUTTER_IMPELLER_BASE_THREAD_SAFETY_H_
 
 #if defined(__clang__)
 #define IPLR_THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
@@ -67,3 +68,5 @@
 
 #define IPLR_NO_THREAD_SAFETY_ANALYSIS \
   IPLR_THREAD_ANNOTATION_ATTRIBUTE__(no_thread_safety_analysis)
+
+#endif  // FLUTTER_IMPELLER_BASE_THREAD_SAFETY_H_
diff --git a/engine/src/flutter/impeller/base/timing.h b/engine/src/flutter/impeller/base/timing.h
index 1496fd9eb9..86ac48ceba 100644
--- a/engine/src/flutter/impeller/base/timing.h
+++ b/engine/src/flutter/impeller/base/timing.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_BASE_TIMING_H_
+#define FLUTTER_IMPELLER_BASE_TIMING_H_
 
 #include <chrono>
 
@@ -14,3 +15,5 @@ using Clock = std::chrono::high_resolution_clock;
 using TimePoint = std::chrono::time_point<std::chrono::high_resolution_clock>;
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_BASE_TIMING_H_
diff --git a/engine/src/flutter/impeller/base/validation.h b/engine/src/flutter/impeller/base/validation.h
index 1e7671adaa..50ebd0c440 100644
--- a/engine/src/flutter/impeller/base/validation.h
+++ b/engine/src/flutter/impeller/base/validation.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_BASE_VALIDATION_H_
+#define FLUTTER_IMPELLER_BASE_VALIDATION_H_
 
 #ifndef IMPELLER_ENABLE_VALIDATION
 #ifdef IMPELLER_DEBUG
@@ -64,3 +65,5 @@ struct ScopedValidationDisable {
 ///   happens in test environments.
 ///
 #define VALIDATION_LOG ::impeller::ValidationLog{}.GetStream()
+
+#endif  // FLUTTER_IMPELLER_BASE_VALIDATION_H_
diff --git a/engine/src/flutter/impeller/base/version.h b/engine/src/flutter/impeller/base/version.h
index 423e56272c..06e03ad394 100644
--- a/engine/src/flutter/impeller/base/version.h
+++ b/engine/src/flutter/impeller/base/version.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_BASE_VERSION_H_
+#define FLUTTER_IMPELLER_BASE_VERSION_H_
 
 #include <cstddef>
 #include <optional>
@@ -37,3 +38,5 @@ struct Version {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_BASE_VERSION_H_
diff --git a/engine/src/flutter/impeller/compiler/compiler.h b/engine/src/flutter/impeller/compiler/compiler.h
index 32f9676743..8447983005 100644
--- a/engine/src/flutter/impeller/compiler/compiler.h
+++ b/engine/src/flutter/impeller/compiler/compiler.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_COMPILER_H_
+#define FLUTTER_IMPELLER_COMPILER_COMPILER_H_
 
 #include <initializer_list>
 #include <sstream>
@@ -64,3 +65,5 @@ class Compiler {
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_COMPILER_H_
diff --git a/engine/src/flutter/impeller/compiler/compiler_backend.h b/engine/src/flutter/impeller/compiler/compiler_backend.h
index ea27801439..4b2aabd0e0 100644
--- a/engine/src/flutter/impeller/compiler/compiler_backend.h
+++ b/engine/src/flutter/impeller/compiler/compiler_backend.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_COMPILER_BACKEND_H_
+#define FLUTTER_IMPELLER_COMPILER_COMPILER_BACKEND_H_
 
 #include <cstdint>
 #include <memory>
@@ -71,3 +72,5 @@ struct CompilerBackend {
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_COMPILER_BACKEND_H_
diff --git a/engine/src/flutter/impeller/compiler/compiler_test.h b/engine/src/flutter/impeller/compiler/compiler_test.h
index 0f3c5f08c7..fdee8a598e 100644
--- a/engine/src/flutter/impeller/compiler/compiler_test.h
+++ b/engine/src/flutter/impeller/compiler/compiler_test.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_COMPILER_TEST_H_
+#define FLUTTER_IMPELLER_COMPILER_COMPILER_TEST_H_
 
 #include "flutter/fml/macros.h"
 #include "flutter/testing/testing.h"
@@ -45,3 +46,5 @@ class CompilerTest : public ::testing::TestWithParam<TargetPlatform> {
 }  // namespace testing
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_COMPILER_TEST_H_
diff --git a/engine/src/flutter/impeller/compiler/constants.h b/engine/src/flutter/impeller/compiler/constants.h
index c31005b833..958a643aca 100644
--- a/engine/src/flutter/impeller/compiler/constants.h
+++ b/engine/src/flutter/impeller/compiler/constants.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_CONSTANTS_H_
+#define FLUTTER_IMPELLER_COMPILER_CONSTANTS_H_
 
 namespace impeller {
 namespace compiler {
@@ -11,3 +12,5 @@ constexpr char kExternalTexturePrefix[] = "SAMPLER_EXTERNAL_OES_";
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_CONSTANTS_H_
diff --git a/engine/src/flutter/impeller/compiler/include_dir.h b/engine/src/flutter/impeller/compiler/include_dir.h
index 0c7927a47f..2a40dd0e36 100644
--- a/engine/src/flutter/impeller/compiler/include_dir.h
+++ b/engine/src/flutter/impeller/compiler/include_dir.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_INCLUDE_DIR_H_
+#define FLUTTER_IMPELLER_COMPILER_INCLUDE_DIR_H_
 
 #include <memory>
 #include <string>
@@ -19,3 +20,5 @@ struct IncludeDir {
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_INCLUDE_DIR_H_
diff --git a/engine/src/flutter/impeller/compiler/includer.h b/engine/src/flutter/impeller/compiler/includer.h
index a3af915317..7012314800 100644
--- a/engine/src/flutter/impeller/compiler/includer.h
+++ b/engine/src/flutter/impeller/compiler/includer.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_INCLUDER_H_
+#define FLUTTER_IMPELLER_COMPILER_INCLUDER_H_
 
 #include <string>
 
@@ -58,3 +59,5 @@ class Includer final : public shaderc::CompileOptions::IncluderInterface {
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_INCLUDER_H_
diff --git a/engine/src/flutter/impeller/compiler/logger.h b/engine/src/flutter/impeller/compiler/logger.h
index d96de575ba..11232d83a8 100644
--- a/engine/src/flutter/impeller/compiler/logger.h
+++ b/engine/src/flutter/impeller/compiler/logger.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_LOGGER_H_
+#define FLUTTER_IMPELLER_COMPILER_LOGGER_H_
 
 #include <sstream>
 #include <string>
@@ -43,3 +44,5 @@ class AutoLogger {
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_LOGGER_H_
diff --git a/engine/src/flutter/impeller/compiler/reflector.h b/engine/src/flutter/impeller/compiler/reflector.h
index bb1572793f..981f004dfe 100644
--- a/engine/src/flutter/impeller/compiler/reflector.h
+++ b/engine/src/flutter/impeller/compiler/reflector.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_REFLECTOR_H_
+#define FLUTTER_IMPELLER_COMPILER_REFLECTOR_H_
 
 #include <cstdint>
 #include <memory>
@@ -177,3 +178,5 @@ class Reflector {
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_REFLECTOR_H_
diff --git a/engine/src/flutter/impeller/compiler/runtime_stage_data.h b/engine/src/flutter/impeller/compiler/runtime_stage_data.h
index 45e3476fc8..0e650d6b98 100644
--- a/engine/src/flutter/impeller/compiler/runtime_stage_data.h
+++ b/engine/src/flutter/impeller/compiler/runtime_stage_data.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_RUNTIME_STAGE_DATA_H_
+#define FLUTTER_IMPELLER_COMPILER_RUNTIME_STAGE_DATA_H_
 
 #include <memory>
 #include <vector>
@@ -58,3 +59,5 @@ class RuntimeStageData {
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_RUNTIME_STAGE_DATA_H_
diff --git a/engine/src/flutter/impeller/compiler/source_options.h b/engine/src/flutter/impeller/compiler/source_options.h
index 5c9983284d..89011f7158 100644
--- a/engine/src/flutter/impeller/compiler/source_options.h
+++ b/engine/src/flutter/impeller/compiler/source_options.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_SOURCE_OPTIONS_H_
+#define FLUTTER_IMPELLER_COMPILER_SOURCE_OPTIONS_H_
 
 #include <cstdint>
 #include <memory>
@@ -48,3 +49,5 @@ struct SourceOptions {
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_SOURCE_OPTIONS_H_
diff --git a/engine/src/flutter/impeller/compiler/spirv_compiler.h b/engine/src/flutter/impeller/compiler/spirv_compiler.h
index c688cd2b46..9f6463d4de 100644
--- a/engine/src/flutter/impeller/compiler/spirv_compiler.h
+++ b/engine/src/flutter/impeller/compiler/spirv_compiler.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_SPIRV_COMPILER_H_
+#define FLUTTER_IMPELLER_COMPILER_SPIRV_COMPILER_H_
 
 #include <cstdint>
 #include <vector>
@@ -75,3 +76,5 @@ class SPIRVCompiler {
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_SPIRV_COMPILER_H_
diff --git a/engine/src/flutter/impeller/compiler/spirv_sksl.h b/engine/src/flutter/impeller/compiler/spirv_sksl.h
index 8e4879d02e..8b1a1b8695 100644
--- a/engine/src/flutter/impeller/compiler/spirv_sksl.h
+++ b/engine/src/flutter/impeller/compiler/spirv_sksl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_SPIRV_SKSL_H_
+#define FLUTTER_IMPELLER_COMPILER_SPIRV_SKSL_H_
 
 #include <cstdint>
 #include <memory>
@@ -78,3 +79,5 @@ class CompilerSkSL : public spirv_cross::CompilerGLSL {
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_SPIRV_SKSL_H_
diff --git a/engine/src/flutter/impeller/compiler/switches.h b/engine/src/flutter/impeller/compiler/switches.h
index c02e344fa4..1c6a561191 100644
--- a/engine/src/flutter/impeller/compiler/switches.h
+++ b/engine/src/flutter/impeller/compiler/switches.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_SWITCHES_H_
+#define FLUTTER_IMPELLER_COMPILER_SWITCHES_H_
 
 #include <cstdint>
 #include <iostream>
@@ -52,3 +53,5 @@ struct Switches {
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_SWITCHES_H_
diff --git a/engine/src/flutter/impeller/compiler/types.h b/engine/src/flutter/impeller/compiler/types.h
index 0af2a5c403..5b55e7a958 100644
--- a/engine/src/flutter/impeller/compiler/types.h
+++ b/engine/src/flutter/impeller/compiler/types.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_TYPES_H_
+#define FLUTTER_IMPELLER_COMPILER_TYPES_H_
 
 #include <codecvt>
 #include <locale>
@@ -79,3 +80,5 @@ spirv_cross::CompilerMSL::Options::Platform TargetPlatformToMSLPlatform(
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_TYPES_H_
diff --git a/engine/src/flutter/impeller/compiler/uniform_sorter.h b/engine/src/flutter/impeller/compiler/uniform_sorter.h
index 5279aaecb6..3493f60b38 100644
--- a/engine/src/flutter/impeller/compiler/uniform_sorter.h
+++ b/engine/src/flutter/impeller/compiler/uniform_sorter.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_UNIFORM_SORTER_H_
+#define FLUTTER_IMPELLER_COMPILER_UNIFORM_SORTER_H_
 
 #include <optional>
 
@@ -25,3 +26,5 @@ std::vector<spirv_cross::ID> SortUniforms(
     bool include = true);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_UNIFORM_SORTER_H_
diff --git a/engine/src/flutter/impeller/compiler/utilities.h b/engine/src/flutter/impeller/compiler/utilities.h
index d1d27436ac..dbbd53d440 100644
--- a/engine/src/flutter/impeller/compiler/utilities.h
+++ b/engine/src/flutter/impeller/compiler/utilities.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_COMPILER_UTILITIES_H_
+#define FLUTTER_IMPELLER_COMPILER_UTILITIES_H_
 
 #include <filesystem>
 #include <string>
@@ -31,3 +32,5 @@ bool StringStartsWith(const std::string& target, const std::string& prefix);
 
 }  // namespace compiler
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_COMPILER_UTILITIES_H_
diff --git a/engine/src/flutter/impeller/core/allocator.h b/engine/src/flutter/impeller/core/allocator.h
index 07c1c93bf6..adcbc65670 100644
--- a/engine/src/flutter/impeller/core/allocator.h
+++ b/engine/src/flutter/impeller/core/allocator.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_ALLOCATOR_H_
+#define FLUTTER_IMPELLER_CORE_ALLOCATOR_H_
 
 #include "flutter/fml/mapping.h"
 #include "impeller/core/device_buffer_descriptor.h"
@@ -63,3 +64,5 @@ class Allocator {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_ALLOCATOR_H_
diff --git a/engine/src/flutter/impeller/core/buffer.h b/engine/src/flutter/impeller/core/buffer.h
index d29e32e1be..0664f1afc5 100644
--- a/engine/src/flutter/impeller/core/buffer.h
+++ b/engine/src/flutter/impeller/core/buffer.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_BUFFER_H_
+#define FLUTTER_IMPELLER_CORE_BUFFER_H_
 
 #include <memory>
 
@@ -20,3 +21,5 @@ class Buffer {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_BUFFER_H_
diff --git a/engine/src/flutter/impeller/core/buffer_view.h b/engine/src/flutter/impeller/core/buffer_view.h
index 1a272a8b29..551bb0b625 100644
--- a/engine/src/flutter/impeller/core/buffer_view.h
+++ b/engine/src/flutter/impeller/core/buffer_view.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_BUFFER_VIEW_H_
+#define FLUTTER_IMPELLER_CORE_BUFFER_VIEW_H_
 
 #include "impeller/core/buffer.h"
 #include "impeller/core/range.h"
@@ -18,3 +19,5 @@ struct BufferView {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_BUFFER_VIEW_H_
diff --git a/engine/src/flutter/impeller/core/capture.h b/engine/src/flutter/impeller/core/capture.h
index 5f41321c2c..9e5c0d9318 100644
--- a/engine/src/flutter/impeller/core/capture.h
+++ b/engine/src/flutter/impeller/core/capture.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_CAPTURE_H_
+#define FLUTTER_IMPELLER_CORE_CAPTURE_H_
 
 #include <functional>
 #include <initializer_list>
@@ -295,3 +296,5 @@ class CaptureContext {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_CAPTURE_H_
diff --git a/engine/src/flutter/impeller/core/device_buffer.h b/engine/src/flutter/impeller/core/device_buffer.h
index ac0d454df2..c3ed289922 100644
--- a/engine/src/flutter/impeller/core/device_buffer.h
+++ b/engine/src/flutter/impeller/core/device_buffer.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_DEVICE_BUFFER_H_
+#define FLUTTER_IMPELLER_CORE_DEVICE_BUFFER_H_
 
 #include <memory>
 #include <string>
@@ -60,3 +61,5 @@ class DeviceBuffer : public Buffer,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_DEVICE_BUFFER_H_
diff --git a/engine/src/flutter/impeller/core/device_buffer_descriptor.h b/engine/src/flutter/impeller/core/device_buffer_descriptor.h
index 976b8f7b0a..d1bf458942 100644
--- a/engine/src/flutter/impeller/core/device_buffer_descriptor.h
+++ b/engine/src/flutter/impeller/core/device_buffer_descriptor.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_DEVICE_BUFFER_DESCRIPTOR_H_
+#define FLUTTER_IMPELLER_CORE_DEVICE_BUFFER_DESCRIPTOR_H_
 
 #include <cstddef>
 
@@ -16,3 +17,5 @@ struct DeviceBufferDescriptor {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_DEVICE_BUFFER_DESCRIPTOR_H_
diff --git a/engine/src/flutter/impeller/core/formats.h b/engine/src/flutter/impeller/core/formats.h
index 071fc3c884..5d5d64299f 100644
--- a/engine/src/flutter/impeller/core/formats.h
+++ b/engine/src/flutter/impeller/core/formats.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_FORMATS_H_
+#define FLUTTER_IMPELLER_CORE_FORMATS_H_
 
 #include <cstdint>
 #include <functional>
@@ -679,3 +680,5 @@ struct hash<impeller::StencilAttachmentDescriptor> {
 };
 
 }  // namespace std
+
+#endif  // FLUTTER_IMPELLER_CORE_FORMATS_H_
diff --git a/engine/src/flutter/impeller/core/host_buffer.h b/engine/src/flutter/impeller/core/host_buffer.h
index 58d5f111b5..5c3a69c75d 100644
--- a/engine/src/flutter/impeller/core/host_buffer.h
+++ b/engine/src/flutter/impeller/core/host_buffer.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_HOST_BUFFER_H_
+#define FLUTTER_IMPELLER_CORE_HOST_BUFFER_H_
 
 #include <algorithm>
 #include <memory>
@@ -162,3 +163,5 @@ class HostBuffer final : public Buffer {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_HOST_BUFFER_H_
diff --git a/engine/src/flutter/impeller/core/platform.h b/engine/src/flutter/impeller/core/platform.h
index 417a0f90c1..824738c02d 100644
--- a/engine/src/flutter/impeller/core/platform.h
+++ b/engine/src/flutter/impeller/core/platform.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_PLATFORM_H_
+#define FLUTTER_IMPELLER_CORE_PLATFORM_H_
 
 #include <cstddef>
 
@@ -20,3 +21,5 @@ constexpr size_t DefaultUniformAlignment() {
 }
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_PLATFORM_H_
diff --git a/engine/src/flutter/impeller/core/range.h b/engine/src/flutter/impeller/core/range.h
index e1a2887813..d0971725c6 100644
--- a/engine/src/flutter/impeller/core/range.h
+++ b/engine/src/flutter/impeller/core/range.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_RANGE_H_
+#define FLUTTER_IMPELLER_CORE_RANGE_H_
 
 #include <cstddef>
 
@@ -25,3 +26,5 @@ struct Range {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_RANGE_H_
diff --git a/engine/src/flutter/impeller/core/resource_binder.h b/engine/src/flutter/impeller/core/resource_binder.h
index a3bbb532f9..6a6172710d 100644
--- a/engine/src/flutter/impeller/core/resource_binder.h
+++ b/engine/src/flutter/impeller/core/resource_binder.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_RESOURCE_BINDER_H_
+#define FLUTTER_IMPELLER_CORE_RESOURCE_BINDER_H_
 
 #include <memory>
 
@@ -35,3 +36,5 @@ struct ResourceBinder {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_RESOURCE_BINDER_H_
diff --git a/engine/src/flutter/impeller/core/runtime_types.h b/engine/src/flutter/impeller/core/runtime_types.h
index 67d66e9784..4fb210d728 100644
--- a/engine/src/flutter/impeller/core/runtime_types.h
+++ b/engine/src/flutter/impeller/core/runtime_types.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_RUNTIME_TYPES_H_
+#define FLUTTER_IMPELLER_CORE_RUNTIME_TYPES_H_
 
 #include <cstddef>
 #include <optional>
@@ -50,3 +51,5 @@ struct RuntimeUniformDescription {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_RUNTIME_TYPES_H_
diff --git a/engine/src/flutter/impeller/core/sampler.h b/engine/src/flutter/impeller/core/sampler.h
index afc3968c4c..0c06ad17d3 100644
--- a/engine/src/flutter/impeller/core/sampler.h
+++ b/engine/src/flutter/impeller/core/sampler.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_SAMPLER_H_
+#define FLUTTER_IMPELLER_CORE_SAMPLER_H_
 
 #include <unordered_map>
 
@@ -36,3 +37,5 @@ using SamplerMap = std::unordered_map<SamplerDescriptor,
                                       ComparableEqual<SamplerDescriptor>>;
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_SAMPLER_H_
diff --git a/engine/src/flutter/impeller/core/sampler_descriptor.h b/engine/src/flutter/impeller/core/sampler_descriptor.h
index 45163b1cc2..0e92745ec3 100644
--- a/engine/src/flutter/impeller/core/sampler_descriptor.h
+++ b/engine/src/flutter/impeller/core/sampler_descriptor.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_SAMPLER_DESCRIPTOR_H_
+#define FLUTTER_IMPELLER_CORE_SAMPLER_DESCRIPTOR_H_
 
 #include "impeller/base/comparable.h"
 #include "impeller/core/formats.h"
@@ -47,3 +48,5 @@ struct SamplerDescriptor final : public Comparable<SamplerDescriptor> {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_SAMPLER_DESCRIPTOR_H_
diff --git a/engine/src/flutter/impeller/core/shader_types.h b/engine/src/flutter/impeller/core/shader_types.h
index 83fd120baf..8b267dbe48 100644
--- a/engine/src/flutter/impeller/core/shader_types.h
+++ b/engine/src/flutter/impeller/core/shader_types.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_SHADER_TYPES_H_
+#define FLUTTER_IMPELLER_CORE_SHADER_TYPES_H_
 
 #include <cstddef>
 #include <cstdint>
@@ -185,3 +186,5 @@ inline constexpr Vector4 ToVector(Color color) {
 }
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_SHADER_TYPES_H_
diff --git a/engine/src/flutter/impeller/core/texture.h b/engine/src/flutter/impeller/core/texture.h
index 8c6e3238b6..b28dbb27ab 100644
--- a/engine/src/flutter/impeller/core/texture.h
+++ b/engine/src/flutter/impeller/core/texture.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_TEXTURE_H_
+#define FLUTTER_IMPELLER_CORE_TEXTURE_H_
 
 #include <string_view>
 
@@ -73,3 +74,5 @@ class Texture {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_TEXTURE_H_
diff --git a/engine/src/flutter/impeller/core/texture_descriptor.h b/engine/src/flutter/impeller/core/texture_descriptor.h
index e168895c67..8c1868f3ce 100644
--- a/engine/src/flutter/impeller/core/texture_descriptor.h
+++ b/engine/src/flutter/impeller/core/texture_descriptor.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_TEXTURE_DESCRIPTOR_H_
+#define FLUTTER_IMPELLER_CORE_TEXTURE_DESCRIPTOR_H_
 
 #include "impeller/core/formats.h"
 #include "impeller/geometry/size.h"
@@ -89,3 +90,5 @@ struct TextureDescriptor {
 std::string TextureDescriptorToString(const TextureDescriptor& desc);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_TEXTURE_DESCRIPTOR_H_
diff --git a/engine/src/flutter/impeller/core/vertex_buffer.h b/engine/src/flutter/impeller/core/vertex_buffer.h
index 7beac43d3c..b88654ce9e 100644
--- a/engine/src/flutter/impeller/core/vertex_buffer.h
+++ b/engine/src/flutter/impeller/core/vertex_buffer.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_CORE_VERTEX_BUFFER_H_
+#define FLUTTER_IMPELLER_CORE_VERTEX_BUFFER_H_
 
 #include "impeller/core/buffer_view.h"
 #include "impeller/core/formats.h"
@@ -34,3 +35,5 @@ struct VertexBuffer {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_CORE_VERTEX_BUFFER_H_
diff --git a/engine/src/flutter/impeller/display_list/dl_dispatcher.h b/engine/src/flutter/impeller/display_list/dl_dispatcher.h
index 10ed7fc610..a0a1fcfb8d 100644
--- a/engine/src/flutter/impeller/display_list/dl_dispatcher.h
+++ b/engine/src/flutter/impeller/display_list/dl_dispatcher.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_DISPLAY_LIST_DL_DISPATCHER_H_
+#define FLUTTER_IMPELLER_DISPLAY_LIST_DL_DISPATCHER_H_
 
 #include "flutter/display_list/dl_op_receiver.h"
 #include "impeller/aiks/canvas_type.h"
@@ -235,3 +236,5 @@ class DlDispatcher final : public flutter::DlOpReceiver {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_DISPLAY_LIST_DL_DISPATCHER_H_
diff --git a/engine/src/flutter/impeller/display_list/dl_image_impeller.h b/engine/src/flutter/impeller/display_list/dl_image_impeller.h
index 8f9e51443b..920c21fc8f 100644
--- a/engine/src/flutter/impeller/display_list/dl_image_impeller.h
+++ b/engine/src/flutter/impeller/display_list/dl_image_impeller.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_DISPLAY_LIST_DL_IMAGE_IMPELLER_H_
+#define FLUTTER_IMPELLER_DISPLAY_LIST_DL_IMAGE_IMPELLER_H_
 
 #include "flutter/display_list/image/dl_image.h"
 #include "impeller/core/texture.h"
@@ -63,3 +64,5 @@ class DlImageImpeller final : public flutter::DlImage {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_DISPLAY_LIST_DL_IMAGE_IMPELLER_H_
diff --git a/engine/src/flutter/impeller/display_list/dl_playground.h b/engine/src/flutter/impeller/display_list/dl_playground.h
index 7b47c36437..b49b1a556e 100644
--- a/engine/src/flutter/impeller/display_list/dl_playground.h
+++ b/engine/src/flutter/impeller/display_list/dl_playground.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_DISPLAY_LIST_DL_PLAYGROUND_H_
+#define FLUTTER_IMPELLER_DISPLAY_LIST_DL_PLAYGROUND_H_
 
 #include "flutter/display_list/display_list.h"
 #include "flutter/display_list/dl_builder.h"
@@ -37,3 +38,5 @@ class DlPlayground : public PlaygroundTest {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_DISPLAY_LIST_DL_PLAYGROUND_H_
diff --git a/engine/src/flutter/impeller/display_list/dl_vertices_geometry.h b/engine/src/flutter/impeller/display_list/dl_vertices_geometry.h
index 466ed932a7..e7502cdc83 100644
--- a/engine/src/flutter/impeller/display_list/dl_vertices_geometry.h
+++ b/engine/src/flutter/impeller/display_list/dl_vertices_geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_DISPLAY_LIST_DL_VERTICES_GEOMETRY_H_
+#define FLUTTER_IMPELLER_DISPLAY_LIST_DL_VERTICES_GEOMETRY_H_
 
 #include "flutter/display_list/dl_vertices.h"
 
@@ -14,3 +15,5 @@ std::shared_ptr<VerticesGeometry> MakeVertices(
     const flutter::DlVertices* vertices);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_DISPLAY_LIST_DL_VERTICES_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/display_list/nine_patch_converter.h b/engine/src/flutter/impeller/display_list/nine_patch_converter.h
index 44afe97d2f..2d0974baa1 100644
--- a/engine/src/flutter/impeller/display_list/nine_patch_converter.h
+++ b/engine/src/flutter/impeller/display_list/nine_patch_converter.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_DISPLAY_LIST_NINE_PATCH_CONVERTER_H_
+#define FLUTTER_IMPELLER_DISPLAY_LIST_NINE_PATCH_CONVERTER_H_
 
 #include <memory>
 
@@ -43,3 +44,5 @@ class NinePatchConverter {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_DISPLAY_LIST_NINE_PATCH_CONVERTER_H_
diff --git a/engine/src/flutter/impeller/display_list/skia_conversions.h b/engine/src/flutter/impeller/display_list/skia_conversions.h
index 6b02c8b609..a0fe839d29 100644
--- a/engine/src/flutter/impeller/display_list/skia_conversions.h
+++ b/engine/src/flutter/impeller/display_list/skia_conversions.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_DISPLAY_LIST_SKIA_CONVERSIONS_H_
+#define FLUTTER_IMPELLER_DISPLAY_LIST_SKIA_CONVERSIONS_H_
 
 #include "display_list/dl_color.h"
 #include "display_list/effects/dl_color_source.h"
@@ -70,3 +71,5 @@ void ConvertStops(const flutter::DlGradientColorSourceBase* gradient,
 
 }  // namespace skia_conversions
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_DISPLAY_LIST_SKIA_CONVERSIONS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/anonymous_contents.h b/engine/src/flutter/impeller/entity/contents/anonymous_contents.h
index a02769b809..0efbfa7487 100644
--- a/engine/src/flutter/impeller/entity/contents/anonymous_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/anonymous_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_ANONYMOUS_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_ANONYMOUS_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -40,3 +41,5 @@ class AnonymousContents final : public Contents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_ANONYMOUS_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/atlas_contents.h b/engine/src/flutter/impeller/entity/contents/atlas_contents.h
index 3e6c595856..12e5e232d3 100644
--- a/engine/src/flutter/impeller/entity/contents/atlas_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/atlas_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_ATLAS_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_ATLAS_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -161,3 +162,5 @@ class AtlasColorContents final : public Contents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_ATLAS_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/checkerboard_contents.h b/engine/src/flutter/impeller/entity/contents/checkerboard_contents.h
index 1c8682a287..43b2ae7942 100644
--- a/engine/src/flutter/impeller/entity/contents/checkerboard_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/checkerboard_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_CHECKERBOARD_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_CHECKERBOARD_CONTENTS_H_
 
 #include "impeller/entity/contents/contents.h"
 
@@ -40,3 +41,5 @@ class CheckerboardContents final : public Contents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_CHECKERBOARD_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/clip_contents.h b/engine/src/flutter/impeller/entity/contents/clip_contents.h
index eaf156b018..b519cc255e 100644
--- a/engine/src/flutter/impeller/entity/contents/clip_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/clip_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_CLIP_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_CLIP_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -100,3 +101,5 @@ class ClipRestoreContents final : public Contents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_CLIP_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/color_source_contents.h b/engine/src/flutter/impeller/entity/contents/color_source_contents.h
index a35d4d2277..ca21097664 100644
--- a/engine/src/flutter/impeller/entity/contents/color_source_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/color_source_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_COLOR_SOURCE_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_COLOR_SOURCE_CONTENTS_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/entity/contents/contents.h"
@@ -113,3 +114,5 @@ class ColorSourceContents : public Contents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_COLOR_SOURCE_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/conical_gradient_contents.h b/engine/src/flutter/impeller/entity/contents/conical_gradient_contents.h
index 52a4a36697..db3b86b98e 100644
--- a/engine/src/flutter/impeller/entity/contents/conical_gradient_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/conical_gradient_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_CONICAL_GRADIENT_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_CONICAL_GRADIENT_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -70,3 +71,5 @@ class ConicalGradientContents final : public ColorSourceContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_CONICAL_GRADIENT_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/content_context.h b/engine/src/flutter/impeller/entity/contents/content_context.h
index e23ddcc1c0..b9ee0ffc93 100644
--- a/engine/src/flutter/impeller/entity/contents/content_context.h
+++ b/engine/src/flutter/impeller/entity/contents/content_context.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_CONTENT_CONTEXT_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_CONTENT_CONTEXT_H_
 
 #include <initializer_list>
 #include <memory>
@@ -909,3 +910,5 @@ class ContentContext {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_CONTENT_CONTEXT_H_
diff --git a/engine/src/flutter/impeller/entity/contents/contents.h b/engine/src/flutter/impeller/entity/contents/contents.h
index d1dbb3349b..9a9ea86609 100644
--- a/engine/src/flutter/impeller/entity/contents/contents.h
+++ b/engine/src/flutter/impeller/entity/contents/contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -201,3 +202,5 @@ class Contents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/blend_filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/blend_filter_contents.h
index 8a3841b32c..562f306034 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/blend_filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/blend_filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_BLEND_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_BLEND_FILTER_CONTENTS_H_
 
 #include <optional>
 #include "impeller/entity/contents/filters/color_filter_contents.h"
@@ -101,3 +102,5 @@ class BlendFilterContents : public ColorFilterContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_BLEND_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/border_mask_blur_filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/border_mask_blur_filter_contents.h
index 90b8e2a44c..10be38dbb7 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/border_mask_blur_filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/border_mask_blur_filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_BORDER_MASK_BLUR_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_BORDER_MASK_BLUR_FILTER_CONTENTS_H_
 
 #include <memory>
 #include <optional>
@@ -56,3 +57,5 @@ class BorderMaskBlurFilterContents final : public FilterContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_BORDER_MASK_BLUR_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/color_filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/color_filter_contents.h
index 7fc77d7e32..14d9cb8aa5 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/color_filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/color_filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_COLOR_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_COLOR_FILTER_CONTENTS_H_
 
 #include "impeller/entity/contents/filters/filter_contents.h"
 
@@ -59,3 +60,5 @@ class ColorFilterContents : public FilterContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_COLOR_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/color_matrix_filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/color_matrix_filter_contents.h
index 6c5c253941..e394125f79 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/color_matrix_filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/color_matrix_filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_COLOR_MATRIX_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_COLOR_MATRIX_FILTER_CONTENTS_H_
 
 #include <memory>
 #include <optional>
@@ -41,3 +42,5 @@ class ColorMatrixFilterContents final : public ColorFilterContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_COLOR_MATRIX_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/directional_gaussian_blur_filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/directional_gaussian_blur_filter_contents.h
index ff15c388c7..2ea5df044f 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/directional_gaussian_blur_filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/directional_gaussian_blur_filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_DIRECTIONAL_GAUSSIAN_BLUR_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_DIRECTIONAL_GAUSSIAN_BLUR_FILTER_CONTENTS_H_
 
 #include <memory>
 #include <optional>
@@ -104,3 +105,5 @@ class DirectionalGaussianBlurFilterContents final : public FilterContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_DIRECTIONAL_GAUSSIAN_BLUR_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/filter_contents.h
index b6aba37776..3e210d8f0f 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_FILTER_CONTENTS_H_
 
 #include <memory>
 #include <optional>
@@ -239,3 +240,5 @@ class FilterContents : public Contents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/gaussian_blur_filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/gaussian_blur_filter_contents.h
index 7d390ddf87..143c6f5ab0 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/gaussian_blur_filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/gaussian_blur_filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_GAUSSIAN_BLUR_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_GAUSSIAN_BLUR_FILTER_CONTENTS_H_
 
 #include <optional>
 #include "impeller/entity/contents/filters/filter_contents.h"
@@ -71,3 +72,5 @@ class GaussianBlurFilterContents final : public FilterContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_GAUSSIAN_BLUR_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/inputs/contents_filter_input.h b/engine/src/flutter/impeller/entity/contents/filters/inputs/contents_filter_input.h
index 983161fa72..8d381b7653 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/inputs/contents_filter_input.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/inputs/contents_filter_input.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_CONTENTS_FILTER_INPUT_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_CONTENTS_FILTER_INPUT_H_
 
 #include "impeller/entity/contents/filters/inputs/filter_input.h"
 
@@ -41,3 +42,5 @@ class ContentsFilterInput final : public FilterInput {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_CONTENTS_FILTER_INPUT_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/inputs/filter_contents_filter_input.h b/engine/src/flutter/impeller/entity/contents/filters/inputs/filter_contents_filter_input.h
index ca3137ac46..965d45b3b1 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/inputs/filter_contents_filter_input.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/inputs/filter_contents_filter_input.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_FILTER_CONTENTS_FILTER_INPUT_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_FILTER_CONTENTS_FILTER_INPUT_H_
 
 #include "impeller/entity/contents/filters/inputs/filter_input.h"
 
@@ -66,3 +67,5 @@ class FilterContentsFilterInput final : public FilterInput {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_FILTER_CONTENTS_FILTER_INPUT_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/inputs/filter_input.h b/engine/src/flutter/impeller/entity/contents/filters/inputs/filter_input.h
index 9d1dd5189e..20a7136b44 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/inputs/filter_input.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/inputs/filter_input.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_FILTER_INPUT_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_FILTER_INPUT_H_
 
 #include <memory>
 #include <optional>
@@ -92,3 +93,5 @@ class FilterInput {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_FILTER_INPUT_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/inputs/placeholder_filter_input.h b/engine/src/flutter/impeller/entity/contents/filters/inputs/placeholder_filter_input.h
index 09d5be61f1..a6305bc22b 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/inputs/placeholder_filter_input.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/inputs/placeholder_filter_input.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_PLACEHOLDER_FILTER_INPUT_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_PLACEHOLDER_FILTER_INPUT_H_
 
 #include "impeller/entity/contents/filters/inputs/filter_input.h"
 
@@ -39,3 +40,5 @@ class PlaceholderFilterInput final : public FilterInput {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_PLACEHOLDER_FILTER_INPUT_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/inputs/texture_filter_input.h b/engine/src/flutter/impeller/entity/contents/filters/inputs/texture_filter_input.h
index 757f570800..320eb1b191 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/inputs/texture_filter_input.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/inputs/texture_filter_input.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_TEXTURE_FILTER_INPUT_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_TEXTURE_FILTER_INPUT_H_
 
 #include "impeller/entity/contents/filters/inputs/filter_input.h"
 
@@ -41,3 +42,5 @@ class TextureFilterInput final : public FilterInput {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_INPUTS_TEXTURE_FILTER_INPUT_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/linear_to_srgb_filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/linear_to_srgb_filter_contents.h
index e70a98c151..d43703896a 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/linear_to_srgb_filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/linear_to_srgb_filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_LINEAR_TO_SRGB_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_LINEAR_TO_SRGB_FILTER_CONTENTS_H_
 
 #include "impeller/entity/contents/filters/color_filter_contents.h"
 #include "impeller/entity/contents/filters/inputs/filter_input.h"
@@ -32,3 +33,5 @@ class LinearToSrgbFilterContents final : public ColorFilterContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_LINEAR_TO_SRGB_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/local_matrix_filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/local_matrix_filter_contents.h
index 5d9e547a35..0340058a02 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/local_matrix_filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/local_matrix_filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_LOCAL_MATRIX_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_LOCAL_MATRIX_FILTER_CONTENTS_H_
 
 #include "impeller/entity/contents/filters/filter_contents.h"
 #include "impeller/entity/contents/filters/inputs/filter_input.h"
@@ -44,3 +45,5 @@ class LocalMatrixFilterContents final : public FilterContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_LOCAL_MATRIX_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/matrix_filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/matrix_filter_contents.h
index bb498ea402..dd6334e416 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/matrix_filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/matrix_filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_MATRIX_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_MATRIX_FILTER_CONTENTS_H_
 
 #include "impeller/entity/contents/filters/filter_contents.h"
 #include "impeller/entity/contents/filters/inputs/filter_input.h"
@@ -56,3 +57,5 @@ class MatrixFilterContents final : public FilterContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_MATRIX_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/morphology_filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/morphology_filter_contents.h
index 91482f4673..db3c23071c 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/morphology_filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/morphology_filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_MORPHOLOGY_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_MORPHOLOGY_FILTER_CONTENTS_H_
 
 #include <memory>
 #include <optional>
@@ -56,3 +57,5 @@ class DirectionalMorphologyFilterContents final : public FilterContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_MORPHOLOGY_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/srgb_to_linear_filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/srgb_to_linear_filter_contents.h
index 4e1b374943..dfadcffbf0 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/srgb_to_linear_filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/srgb_to_linear_filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_SRGB_TO_LINEAR_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_SRGB_TO_LINEAR_FILTER_CONTENTS_H_
 
 #include "impeller/entity/contents/filters/color_filter_contents.h"
 #include "impeller/entity/contents/filters/inputs/filter_input.h"
@@ -32,3 +33,5 @@ class SrgbToLinearFilterContents final : public ColorFilterContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_SRGB_TO_LINEAR_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/filters/yuv_to_rgb_filter_contents.h b/engine/src/flutter/impeller/entity/contents/filters/yuv_to_rgb_filter_contents.h
index ef3ae2e522..efa903f0d9 100644
--- a/engine/src/flutter/impeller/entity/contents/filters/yuv_to_rgb_filter_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/filters/yuv_to_rgb_filter_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_YUV_TO_RGB_FILTER_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_YUV_TO_RGB_FILTER_CONTENTS_H_
 
 #include "impeller/entity/contents/filters/filter_contents.h"
 
@@ -39,3 +40,5 @@ class YUVToRGBFilterContents final : public FilterContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_YUV_TO_RGB_FILTER_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/framebuffer_blend_contents.h b/engine/src/flutter/impeller/entity/contents/framebuffer_blend_contents.h
index ac5b57229f..5335055bd3 100644
--- a/engine/src/flutter/impeller/entity/contents/framebuffer_blend_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/framebuffer_blend_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_FRAMEBUFFER_BLEND_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_FRAMEBUFFER_BLEND_CONTENTS_H_
 
 #include <memory>
 
@@ -57,3 +58,5 @@ class FramebufferBlendContents final : public ColorSourceContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_FRAMEBUFFER_BLEND_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/gradient_generator.h b/engine/src/flutter/impeller/entity/contents/gradient_generator.h
index 24321d8612..8c3c02e9d9 100644
--- a/engine/src/flutter/impeller/entity/contents/gradient_generator.h
+++ b/engine/src/flutter/impeller/entity/contents/gradient_generator.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_GRADIENT_GENERATOR_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_GRADIENT_GENERATOR_H_
 
 #include <functional>
 #include <memory>
@@ -45,3 +46,5 @@ std::vector<StopData> CreateGradientColors(const std::vector<Color>& colors,
                                            const std::vector<Scalar>& stops);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_GRADIENT_GENERATOR_H_
diff --git a/engine/src/flutter/impeller/entity/contents/linear_gradient_contents.h b/engine/src/flutter/impeller/entity/contents/linear_gradient_contents.h
index e73fa8eed8..75b24a3ab9 100644
--- a/engine/src/flutter/impeller/entity/contents/linear_gradient_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/linear_gradient_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_LINEAR_GRADIENT_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_LINEAR_GRADIENT_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -71,3 +72,5 @@ class LinearGradientContents final : public ColorSourceContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_LINEAR_GRADIENT_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/radial_gradient_contents.h b/engine/src/flutter/impeller/entity/contents/radial_gradient_contents.h
index 8e5ae3e121..87bd981942 100644
--- a/engine/src/flutter/impeller/entity/contents/radial_gradient_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/radial_gradient_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_RADIAL_GRADIENT_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_RADIAL_GRADIENT_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -69,3 +70,5 @@ class RadialGradientContents final : public ColorSourceContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_RADIAL_GRADIENT_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/runtime_effect_contents.h b/engine/src/flutter/impeller/entity/contents/runtime_effect_contents.h
index ada5f58265..c92b6eff24 100644
--- a/engine/src/flutter/impeller/entity/contents/runtime_effect_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/runtime_effect_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_RUNTIME_EFFECT_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_RUNTIME_EFFECT_CONTENTS_H_
 
 #include <memory>
 #include <vector>
@@ -41,3 +42,5 @@ class RuntimeEffectContents final : public ColorSourceContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_RUNTIME_EFFECT_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/scene_contents.h b/engine/src/flutter/impeller/entity/contents/scene_contents.h
index b1f443cd75..e5b249baf9 100644
--- a/engine/src/flutter/impeller/entity/contents/scene_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/scene_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_SCENE_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_SCENE_CONTENTS_H_
 
 #if !IMPELLER_ENABLE_3D
 static_assert(false);
@@ -39,3 +40,5 @@ class SceneContents final : public ColorSourceContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_SCENE_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/solid_color_contents.h b/engine/src/flutter/impeller/entity/contents/solid_color_contents.h
index d0cc492712..8fb7fc9461 100644
--- a/engine/src/flutter/impeller/entity/contents/solid_color_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/solid_color_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_SOLID_COLOR_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_SOLID_COLOR_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -63,3 +64,5 @@ class SolidColorContents final : public ColorSourceContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_SOLID_COLOR_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/solid_rrect_blur_contents.h b/engine/src/flutter/impeller/entity/contents/solid_rrect_blur_contents.h
index 41930406a8..6d697b257e 100644
--- a/engine/src/flutter/impeller/entity/contents/solid_rrect_blur_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/solid_rrect_blur_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_SOLID_RRECT_BLUR_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_SOLID_RRECT_BLUR_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -60,3 +61,5 @@ class SolidRRectBlurContents final : public Contents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_SOLID_RRECT_BLUR_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/sweep_gradient_contents.h b/engine/src/flutter/impeller/entity/contents/sweep_gradient_contents.h
index 1760cb3de9..d46fbee857 100644
--- a/engine/src/flutter/impeller/entity/contents/sweep_gradient_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/sweep_gradient_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_SWEEP_GRADIENT_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_SWEEP_GRADIENT_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -72,3 +73,5 @@ class SweepGradientContents final : public ColorSourceContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_SWEEP_GRADIENT_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/test/contents_test_helpers.h b/engine/src/flutter/impeller/entity/contents/test/contents_test_helpers.h
index e65b5636ef..afcef40c84 100644
--- a/engine/src/flutter/impeller/entity/contents/test/contents_test_helpers.h
+++ b/engine/src/flutter/impeller/entity/contents/test/contents_test_helpers.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_TEST_CONTENTS_TEST_HELPERS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_TEST_CONTENTS_TEST_HELPERS_H_
 
 #include "impeller/renderer/command.h"
 
@@ -43,3 +44,5 @@ typename T::FragInfo* GetFragInfo(const Command& command) {
 }
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_TEST_CONTENTS_TEST_HELPERS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/text_contents.h b/engine/src/flutter/impeller/entity/contents/text_contents.h
index 22a0bd04e6..c7deaa3642 100644
--- a/engine/src/flutter/impeller/entity/contents/text_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/text_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_TEXT_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_TEXT_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -80,3 +81,5 @@ class TextContents final : public Contents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_TEXT_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/texture_contents.h b/engine/src/flutter/impeller/entity/contents/texture_contents.h
index 1cee26ac20..5c9921fd30 100644
--- a/engine/src/flutter/impeller/entity/contents/texture_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/texture_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_TEXTURE_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_TEXTURE_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -94,3 +95,5 @@ class TextureContents final : public Contents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_TEXTURE_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/tiled_texture_contents.h b/engine/src/flutter/impeller/entity/contents/tiled_texture_contents.h
index 90ee30af73..b0a4af1dab 100644
--- a/engine/src/flutter/impeller/entity/contents/tiled_texture_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/tiled_texture_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_TILED_TEXTURE_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_TILED_TEXTURE_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -83,3 +84,5 @@ class TiledTextureContents final : public ColorSourceContents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_TILED_TEXTURE_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/contents/vertices_contents.h b/engine/src/flutter/impeller/entity/contents/vertices_contents.h
index 8aedfdf909..b5d3590f02 100644
--- a/engine/src/flutter/impeller/entity/contents/vertices_contents.h
+++ b/engine/src/flutter/impeller/entity/contents/vertices_contents.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_CONTENTS_VERTICES_CONTENTS_H_
+#define FLUTTER_IMPELLER_ENTITY_CONTENTS_VERTICES_CONTENTS_H_
 
 #include <functional>
 #include <memory>
@@ -108,3 +109,5 @@ class VerticesUVContents final : public Contents {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_CONTENTS_VERTICES_CONTENTS_H_
diff --git a/engine/src/flutter/impeller/entity/entity.h b/engine/src/flutter/impeller/entity/entity.h
index c5d98b5a11..72671320dc 100644
--- a/engine/src/flutter/impeller/entity/entity.h
+++ b/engine/src/flutter/impeller/entity/entity.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_ENTITY_H_
+#define FLUTTER_IMPELLER_ENTITY_ENTITY_H_
 
 #include <cstdint>
 
@@ -128,3 +129,5 @@ class Entity {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_ENTITY_H_
diff --git a/engine/src/flutter/impeller/entity/entity_pass.h b/engine/src/flutter/impeller/entity/entity_pass.h
index 08b34377a4..1ff08f077e 100644
--- a/engine/src/flutter/impeller/entity/entity_pass.h
+++ b/engine/src/flutter/impeller/entity/entity_pass.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_ENTITY_PASS_H_
+#define FLUTTER_IMPELLER_ENTITY_ENTITY_PASS_H_
 
 #include <cstdint>
 #include <functional>
@@ -335,3 +336,5 @@ class EntityPassClipRecorder {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_ENTITY_PASS_H_
diff --git a/engine/src/flutter/impeller/entity/entity_pass_delegate.h b/engine/src/flutter/impeller/entity/entity_pass_delegate.h
index 8708edf18b..72a38af65e 100644
--- a/engine/src/flutter/impeller/entity/entity_pass_delegate.h
+++ b/engine/src/flutter/impeller/entity/entity_pass_delegate.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_ENTITY_PASS_DELEGATE_H_
+#define FLUTTER_IMPELLER_ENTITY_ENTITY_PASS_DELEGATE_H_
 
 #include <memory>
 
@@ -45,3 +46,5 @@ class EntityPassDelegate {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_ENTITY_PASS_DELEGATE_H_
diff --git a/engine/src/flutter/impeller/entity/entity_pass_target.h b/engine/src/flutter/impeller/entity/entity_pass_target.h
index 76e90ece6f..204944e4b3 100644
--- a/engine/src/flutter/impeller/entity/entity_pass_target.h
+++ b/engine/src/flutter/impeller/entity/entity_pass_target.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_ENTITY_PASS_TARGET_H_
+#define FLUTTER_IMPELLER_ENTITY_ENTITY_PASS_TARGET_H_
 
 #include "fml/macros.h"
 #include "impeller/renderer/render_target.h"
@@ -43,3 +44,5 @@ class EntityPassTarget {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_ENTITY_PASS_TARGET_H_
diff --git a/engine/src/flutter/impeller/entity/entity_playground.h b/engine/src/flutter/impeller/entity/entity_playground.h
index 10604f6072..41dc21658e 100644
--- a/engine/src/flutter/impeller/entity/entity_playground.h
+++ b/engine/src/flutter/impeller/entity/entity_playground.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_ENTITY_PLAYGROUND_H_
+#define FLUTTER_IMPELLER_ENTITY_ENTITY_PLAYGROUND_H_
 
 #include "impeller/playground/playground_test.h"
 
@@ -43,3 +44,5 @@ class EntityPlayground : public PlaygroundTest {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_ENTITY_PLAYGROUND_H_
diff --git a/engine/src/flutter/impeller/entity/geometry/circle_geometry.h b/engine/src/flutter/impeller/entity/geometry/circle_geometry.h
index d74c41b99c..be75f89131 100644
--- a/engine/src/flutter/impeller/entity/geometry/circle_geometry.h
+++ b/engine/src/flutter/impeller/entity/geometry/circle_geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_GEOMETRY_CIRCLE_GEOMETRY_H_
+#define FLUTTER_IMPELLER_ENTITY_GEOMETRY_CIRCLE_GEOMETRY_H_
 
 #include "impeller/entity/geometry/geometry.h"
 
@@ -55,3 +56,5 @@ class CircleGeometry final : public Geometry {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_GEOMETRY_CIRCLE_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/entity/geometry/cover_geometry.h b/engine/src/flutter/impeller/entity/geometry/cover_geometry.h
index 653b0c5f97..3d7675648e 100644
--- a/engine/src/flutter/impeller/entity/geometry/cover_geometry.h
+++ b/engine/src/flutter/impeller/entity/geometry/cover_geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_GEOMETRY_COVER_GEOMETRY_H_
+#define FLUTTER_IMPELLER_ENTITY_GEOMETRY_COVER_GEOMETRY_H_
 
 #include "impeller/entity/geometry/geometry.h"
 
@@ -46,3 +47,5 @@ class CoverGeometry final : public Geometry {
 static_assert(std::is_trivially_destructible<CoverGeometry>::value);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_GEOMETRY_COVER_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/entity/geometry/ellipse_geometry.h b/engine/src/flutter/impeller/entity/geometry/ellipse_geometry.h
index cd294a67bd..892d03568e 100644
--- a/engine/src/flutter/impeller/entity/geometry/ellipse_geometry.h
+++ b/engine/src/flutter/impeller/entity/geometry/ellipse_geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_GEOMETRY_ELLIPSE_GEOMETRY_H_
+#define FLUTTER_IMPELLER_ENTITY_GEOMETRY_ELLIPSE_GEOMETRY_H_
 
 #include "impeller/entity/geometry/geometry.h"
 
@@ -51,3 +52,5 @@ class EllipseGeometry final : public Geometry {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_GEOMETRY_ELLIPSE_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/entity/geometry/fill_path_geometry.h b/engine/src/flutter/impeller/entity/geometry/fill_path_geometry.h
index 690db3ea52..a1210846b3 100644
--- a/engine/src/flutter/impeller/entity/geometry/fill_path_geometry.h
+++ b/engine/src/flutter/impeller/entity/geometry/fill_path_geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_GEOMETRY_FILL_PATH_GEOMETRY_H_
+#define FLUTTER_IMPELLER_ENTITY_GEOMETRY_FILL_PATH_GEOMETRY_H_
 
 #include <optional>
 
@@ -50,3 +51,5 @@ class FillPathGeometry final : public Geometry {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_GEOMETRY_FILL_PATH_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/entity/geometry/geometry.h b/engine/src/flutter/impeller/entity/geometry/geometry.h
index a58dfec38d..a958f8e5aa 100644
--- a/engine/src/flutter/impeller/entity/geometry/geometry.h
+++ b/engine/src/flutter/impeller/entity/geometry/geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_GEOMETRY_GEOMETRY_H_
+#define FLUTTER_IMPELLER_ENTITY_GEOMETRY_GEOMETRY_H_
 
 #include "impeller/core/formats.h"
 #include "impeller/core/vertex_buffer.h"
@@ -134,3 +135,5 @@ class Geometry {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_GEOMETRY_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/entity/geometry/line_geometry.h b/engine/src/flutter/impeller/entity/geometry/line_geometry.h
index 19bf5665ae..58032074ed 100644
--- a/engine/src/flutter/impeller/entity/geometry/line_geometry.h
+++ b/engine/src/flutter/impeller/entity/geometry/line_geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_GEOMETRY_LINE_GEOMETRY_H_
+#define FLUTTER_IMPELLER_ENTITY_GEOMETRY_LINE_GEOMETRY_H_
 
 #include <type_traits>
 #include "impeller/entity/geometry/geometry.h"
@@ -76,3 +77,5 @@ class LineGeometry final : public Geometry {
 static_assert(std::is_trivially_destructible<LineGeometry>::value);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_GEOMETRY_LINE_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/entity/geometry/point_field_geometry.h b/engine/src/flutter/impeller/entity/geometry/point_field_geometry.h
index 944db2df96..9d43f07cb9 100644
--- a/engine/src/flutter/impeller/entity/geometry/point_field_geometry.h
+++ b/engine/src/flutter/impeller/entity/geometry/point_field_geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_GEOMETRY_POINT_FIELD_GEOMETRY_H_
+#define FLUTTER_IMPELLER_ENTITY_GEOMETRY_POINT_FIELD_GEOMETRY_H_
 
 #include "impeller/entity/geometry/geometry.h"
 
@@ -57,3 +58,5 @@ class PointFieldGeometry final : public Geometry {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_GEOMETRY_POINT_FIELD_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/entity/geometry/rect_geometry.h b/engine/src/flutter/impeller/entity/geometry/rect_geometry.h
index 35f1762ed2..91842a0276 100644
--- a/engine/src/flutter/impeller/entity/geometry/rect_geometry.h
+++ b/engine/src/flutter/impeller/entity/geometry/rect_geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_GEOMETRY_RECT_GEOMETRY_H_
+#define FLUTTER_IMPELLER_ENTITY_GEOMETRY_RECT_GEOMETRY_H_
 
 #include "impeller/entity/geometry/geometry.h"
 
@@ -49,3 +50,5 @@ class RectGeometry final : public Geometry {
 static_assert(std::is_trivially_destructible<RectGeometry>::value);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_GEOMETRY_RECT_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/entity/geometry/round_rect_geometry.h b/engine/src/flutter/impeller/entity/geometry/round_rect_geometry.h
index 36d345fc49..78f0523a20 100644
--- a/engine/src/flutter/impeller/entity/geometry/round_rect_geometry.h
+++ b/engine/src/flutter/impeller/entity/geometry/round_rect_geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_GEOMETRY_ROUND_RECT_GEOMETRY_H_
+#define FLUTTER_IMPELLER_ENTITY_GEOMETRY_ROUND_RECT_GEOMETRY_H_
 
 #include "impeller/entity/geometry/geometry.h"
 
@@ -52,3 +53,5 @@ class RoundRectGeometry final : public Geometry {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_GEOMETRY_ROUND_RECT_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/entity/geometry/stroke_path_geometry.h b/engine/src/flutter/impeller/entity/geometry/stroke_path_geometry.h
index 32db2d0d8b..ef08a98ed5 100644
--- a/engine/src/flutter/impeller/entity/geometry/stroke_path_geometry.h
+++ b/engine/src/flutter/impeller/entity/geometry/stroke_path_geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_GEOMETRY_STROKE_PATH_GEOMETRY_H_
+#define FLUTTER_IMPELLER_ENTITY_GEOMETRY_STROKE_PATH_GEOMETRY_H_
 
 #include "impeller/entity/geometry/geometry.h"
 
@@ -94,3 +95,5 @@ class StrokePathGeometry final : public Geometry {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_GEOMETRY_STROKE_PATH_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/entity/geometry/vertices_geometry.h b/engine/src/flutter/impeller/entity/geometry/vertices_geometry.h
index 1e32961fd5..8f4d2be485 100644
--- a/engine/src/flutter/impeller/entity/geometry/vertices_geometry.h
+++ b/engine/src/flutter/impeller/entity/geometry/vertices_geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_GEOMETRY_VERTICES_GEOMETRY_H_
+#define FLUTTER_IMPELLER_ENTITY_GEOMETRY_VERTICES_GEOMETRY_H_
 
 #include "impeller/entity/geometry/geometry.h"
 
@@ -69,3 +70,5 @@ class VerticesGeometry final : public Geometry {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_GEOMETRY_VERTICES_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/entity/inline_pass_context.h b/engine/src/flutter/impeller/entity/inline_pass_context.h
index 4da816478a..595d291b5a 100644
--- a/engine/src/flutter/impeller/entity/inline_pass_context.h
+++ b/engine/src/flutter/impeller/entity/inline_pass_context.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_INLINE_PASS_CONTEXT_H_
+#define FLUTTER_IMPELLER_ENTITY_INLINE_PASS_CONTEXT_H_
 
 #include <cstdint>
 
@@ -60,3 +61,5 @@ class InlinePassContext {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_INLINE_PASS_CONTEXT_H_
diff --git a/engine/src/flutter/impeller/entity/render_target_cache.h b/engine/src/flutter/impeller/entity/render_target_cache.h
index 4be1c1daeb..b59bd43983 100644
--- a/engine/src/flutter/impeller/entity/render_target_cache.h
+++ b/engine/src/flutter/impeller/entity/render_target_cache.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_ENTITY_RENDER_TARGET_CACHE_H_
+#define FLUTTER_IMPELLER_ENTITY_RENDER_TARGET_CACHE_H_
 
 #include "impeller/renderer/render_target.h"
 
@@ -45,3 +46,5 @@ class RenderTargetCache : public RenderTargetAllocator {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_ENTITY_RENDER_TARGET_CACHE_H_
diff --git a/engine/src/flutter/impeller/fixtures/golden_paths.h b/engine/src/flutter/impeller/fixtures/golden_paths.h
index 95fae57792..16767f766b 100644
--- a/engine/src/flutter/impeller/fixtures/golden_paths.h
+++ b/engine/src/flutter/impeller/fixtures/golden_paths.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_FIXTURES_GOLDEN_PATHS_H_
+#define FLUTTER_IMPELLER_FIXTURES_GOLDEN_PATHS_H_
 
 #include <vector>
 
@@ -67,3 +68,5 @@ std::vector<Point> golden_cubic_and_quad_points = {
 
 }  // namespace testing
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_FIXTURES_GOLDEN_PATHS_H_
diff --git a/engine/src/flutter/impeller/fixtures/types.h b/engine/src/flutter/impeller/fixtures/types.h
index aca0e96ad7..e26dbee068 100644
--- a/engine/src/flutter/impeller/fixtures/types.h
+++ b/engine/src/flutter/impeller/fixtures/types.h
@@ -2,10 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_FIXTURES_TYPES_H_
+#define FLUTTER_IMPELLER_FIXTURES_TYPES_H_
 
 struct Uniforms {
   mat4 model;
   mat4 view;
   mat4 projection;
 };
+
+#endif  // FLUTTER_IMPELLER_FIXTURES_TYPES_H_
diff --git a/engine/src/flutter/impeller/geometry/color.h b/engine/src/flutter/impeller/geometry/color.h
index e31a82031b..6aa8b502ae 100644
--- a/engine/src/flutter/impeller/geometry/color.h
+++ b/engine/src/flutter/impeller/geometry/color.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_COLOR_H_
+#define FLUTTER_IMPELLER_GEOMETRY_COLOR_H_
 
 #include <stdint.h>
 #include <algorithm>
@@ -954,3 +955,5 @@ inline std::ostream& operator<<(std::ostream& out, const impeller::Color& c) {
 }
 
 }  // namespace std
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_COLOR_H_
diff --git a/engine/src/flutter/impeller/geometry/constants.h b/engine/src/flutter/impeller/geometry/constants.h
index eb600e90da..2fa8e037db 100644
--- a/engine/src/flutter/impeller/geometry/constants.h
+++ b/engine/src/flutter/impeller/geometry/constants.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_CONSTANTS_H_
+#define FLUTTER_IMPELLER_GEOMETRY_CONSTANTS_H_
 
 namespace impeller {
 
@@ -55,3 +56,5 @@ constexpr float kPhi = 1.61803398874989484820f;
 constexpr float kEhCloseEnough = 1e-3f;
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_CONSTANTS_H_
diff --git a/engine/src/flutter/impeller/geometry/geometry_asserts.h b/engine/src/flutter/impeller/geometry/geometry_asserts.h
index de38b445fb..f5eeac9550 100644
--- a/engine/src/flutter/impeller/geometry/geometry_asserts.h
+++ b/engine/src/flutter/impeller/geometry/geometry_asserts.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_GEOMETRY_ASSERTS_H_
+#define FLUTTER_IMPELLER_GEOMETRY_GEOMETRY_ASSERTS_H_
 
 #include <array>
 #include <iostream>
@@ -175,3 +176,5 @@ inline ::testing::AssertionResult ColorsNear(std::vector<impeller::Color> a,
 #define EXPECT_ARRAY_4_NEAR(a, b) EXPECT_PRED2(&::Array4Near, a, b)
 #define EXPECT_COLOR_BUFFER_NEAR(a, b) EXPECT_PRED2(&::ColorBufferNear, a, b)
 #define EXPECT_COLORS_NEAR(a, b) EXPECT_PRED2(&::ColorsNear, a, b)
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_GEOMETRY_ASSERTS_H_
diff --git a/engine/src/flutter/impeller/geometry/gradient.h b/engine/src/flutter/impeller/geometry/gradient.h
index 5aca0be745..8d6e70a2e3 100644
--- a/engine/src/flutter/impeller/geometry/gradient.h
+++ b/engine/src/flutter/impeller/geometry/gradient.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_GRADIENT_H_
+#define FLUTTER_IMPELLER_GEOMETRY_GRADIENT_H_
 
 #include <cstdint>
 #include <memory>
@@ -32,3 +33,5 @@ GradientData CreateGradientBuffer(const std::vector<Color>& colors,
                                   const std::vector<Scalar>& stops);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_GRADIENT_H_
diff --git a/engine/src/flutter/impeller/geometry/half.h b/engine/src/flutter/impeller/geometry/half.h
index d5aef60e0d..8ab60a0f57 100644
--- a/engine/src/flutter/impeller/geometry/half.h
+++ b/engine/src/flutter/impeller/geometry/half.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_HALF_H_
+#define FLUTTER_IMPELLER_GEOMETRY_HALF_H_
 
 #include <cstdint>
 
@@ -190,3 +191,5 @@ inline std::ostream& operator<<(std::ostream& out,
 // NOLINTEND(google-explicit-constructor)
 
 }  // namespace std
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_HALF_H_
diff --git a/engine/src/flutter/impeller/geometry/matrix.h b/engine/src/flutter/impeller/geometry/matrix.h
index 2a4e222c17..dab9186e69 100644
--- a/engine/src/flutter/impeller/geometry/matrix.h
+++ b/engine/src/flutter/impeller/geometry/matrix.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_MATRIX_H_
+#define FLUTTER_IMPELLER_GEOMETRY_MATRIX_H_
 
 #include <cmath>
 #include <iomanip>
@@ -527,3 +528,5 @@ inline std::ostream& operator<<(std::ostream& out, const impeller::Matrix& m) {
 }
 
 }  // namespace std
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_MATRIX_H_
diff --git a/engine/src/flutter/impeller/geometry/matrix_decomposition.h b/engine/src/flutter/impeller/geometry/matrix_decomposition.h
index 31c01ec5c6..a5b6592f26 100644
--- a/engine/src/flutter/impeller/geometry/matrix_decomposition.h
+++ b/engine/src/flutter/impeller/geometry/matrix_decomposition.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_MATRIX_DECOMPOSITION_H_
+#define FLUTTER_IMPELLER_GEOMETRY_MATRIX_DECOMPOSITION_H_
 
 #include "impeller/geometry/quaternion.h"
 #include "impeller/geometry/scalar.h"
@@ -30,3 +31,5 @@ struct MatrixDecomposition {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_MATRIX_DECOMPOSITION_H_
diff --git a/engine/src/flutter/impeller/geometry/path.h b/engine/src/flutter/impeller/geometry/path.h
index 0b1e5962a2..f4f5800ab1 100644
--- a/engine/src/flutter/impeller/geometry/path.h
+++ b/engine/src/flutter/impeller/geometry/path.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_PATH_H_
+#define FLUTTER_IMPELLER_GEOMETRY_PATH_H_
 
 #include <functional>
 #include <optional>
@@ -234,3 +235,5 @@ class Path {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_PATH_H_
diff --git a/engine/src/flutter/impeller/geometry/path_builder.h b/engine/src/flutter/impeller/geometry/path_builder.h
index d6c302f164..826d2abfc2 100644
--- a/engine/src/flutter/impeller/geometry/path_builder.h
+++ b/engine/src/flutter/impeller/geometry/path_builder.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_PATH_BUILDER_H_
+#define FLUTTER_IMPELLER_GEOMETRY_PATH_BUILDER_H_
 
 #include "impeller/geometry/path.h"
 #include "impeller/geometry/rect.h"
@@ -174,3 +175,5 @@ class PathBuilder {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_PATH_BUILDER_H_
diff --git a/engine/src/flutter/impeller/geometry/path_component.h b/engine/src/flutter/impeller/geometry/path_component.h
index c47b55cbec..8bf1018925 100644
--- a/engine/src/flutter/impeller/geometry/path_component.h
+++ b/engine/src/flutter/impeller/geometry/path_component.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_PATH_COMPONENT_H_
+#define FLUTTER_IMPELLER_GEOMETRY_PATH_COMPONENT_H_
 
 #include <type_traits>
 #include <variant>
@@ -184,3 +185,5 @@ static_assert(!std::is_polymorphic<QuadraticPathComponent>::value);
 static_assert(!std::is_polymorphic<CubicPathComponent>::value);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_PATH_COMPONENT_H_
diff --git a/engine/src/flutter/impeller/geometry/point.h b/engine/src/flutter/impeller/geometry/point.h
index f8a00c1252..ad978a08ab 100644
--- a/engine/src/flutter/impeller/geometry/point.h
+++ b/engine/src/flutter/impeller/geometry/point.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_POINT_H_
+#define FLUTTER_IMPELLER_GEOMETRY_POINT_H_
 
 #include <algorithm>
 #include <cmath>
@@ -323,3 +324,5 @@ inline std::ostream& operator<<(std::ostream& out,
 }
 
 }  // namespace std
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_POINT_H_
diff --git a/engine/src/flutter/impeller/geometry/quaternion.h b/engine/src/flutter/impeller/geometry/quaternion.h
index 3a5738250f..408f5c04ed 100644
--- a/engine/src/flutter/impeller/geometry/quaternion.h
+++ b/engine/src/flutter/impeller/geometry/quaternion.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_QUATERNION_H_
+#define FLUTTER_IMPELLER_GEOMETRY_QUATERNION_H_
 
 #include <ostream>
 
@@ -97,3 +98,5 @@ inline std::ostream& operator<<(std::ostream& out,
 }
 
 }  // namespace std
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_QUATERNION_H_
diff --git a/engine/src/flutter/impeller/geometry/rect.h b/engine/src/flutter/impeller/geometry/rect.h
index 20781582b7..c371512ccf 100644
--- a/engine/src/flutter/impeller/geometry/rect.h
+++ b/engine/src/flutter/impeller/geometry/rect.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_RECT_H_
+#define FLUTTER_IMPELLER_GEOMETRY_RECT_H_
 
 #include <array>
 #include <optional>
@@ -436,3 +437,5 @@ inline std::ostream& operator<<(std::ostream& out,
 }
 
 }  // namespace std
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_RECT_H_
diff --git a/engine/src/flutter/impeller/geometry/scalar.h b/engine/src/flutter/impeller/geometry/scalar.h
index ffdc58e336..2600a49c42 100644
--- a/engine/src/flutter/impeller/geometry/scalar.h
+++ b/engine/src/flutter/impeller/geometry/scalar.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_SCALAR_H_
+#define FLUTTER_IMPELLER_GEOMETRY_SCALAR_H_
 
 #include <cfloat>
 #include <type_traits>
@@ -57,3 +58,5 @@ struct Degrees {
 // NOLINTEND(google-explicit-constructor)
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_SCALAR_H_
diff --git a/engine/src/flutter/impeller/geometry/shear.h b/engine/src/flutter/impeller/geometry/shear.h
index 155f7ea7fa..c94e26e5f0 100644
--- a/engine/src/flutter/impeller/geometry/shear.h
+++ b/engine/src/flutter/impeller/geometry/shear.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_SHEAR_H_
+#define FLUTTER_IMPELLER_GEOMETRY_SHEAR_H_
 
 #include <string>
 
@@ -30,3 +31,5 @@ struct Shear {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_SHEAR_H_
diff --git a/engine/src/flutter/impeller/geometry/sigma.h b/engine/src/flutter/impeller/geometry/sigma.h
index c909128be4..9ea85498db 100644
--- a/engine/src/flutter/impeller/geometry/sigma.h
+++ b/engine/src/flutter/impeller/geometry/sigma.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_SIGMA_H_
+#define FLUTTER_IMPELLER_GEOMETRY_SIGMA_H_
 
 #include "impeller/geometry/scalar.h"
 
@@ -55,3 +56,5 @@ struct Radius {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_SIGMA_H_
diff --git a/engine/src/flutter/impeller/geometry/size.h b/engine/src/flutter/impeller/geometry/size.h
index 9a40dc9a0c..5c1c9c96c9 100644
--- a/engine/src/flutter/impeller/geometry/size.h
+++ b/engine/src/flutter/impeller/geometry/size.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_SIZE_H_
+#define FLUTTER_IMPELLER_GEOMETRY_SIZE_H_
 
 #include <algorithm>
 #include <cmath>
@@ -150,3 +151,5 @@ inline std::ostream& operator<<(std::ostream& out,
 }
 
 }  // namespace std
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_SIZE_H_
diff --git a/engine/src/flutter/impeller/geometry/trig.h b/engine/src/flutter/impeller/geometry/trig.h
index 332c8ee1dd..da43375744 100644
--- a/engine/src/flutter/impeller/geometry/trig.h
+++ b/engine/src/flutter/impeller/geometry/trig.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_TRIG_H_
+#define FLUTTER_IMPELLER_GEOMETRY_TRIG_H_
 
 #include <functional>
 #include <vector>
@@ -37,3 +38,5 @@ struct Trig {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_TRIG_H_
diff --git a/engine/src/flutter/impeller/geometry/type_traits.h b/engine/src/flutter/impeller/geometry/type_traits.h
index 4e884d16c1..7fc0ac4360 100644
--- a/engine/src/flutter/impeller/geometry/type_traits.h
+++ b/engine/src/flutter/impeller/geometry/type_traits.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_TYPE_TRAITS_H_
+#define FLUTTER_IMPELLER_GEOMETRY_TYPE_TRAITS_H_
 
 #include <type_traits>
 
@@ -18,3 +19,5 @@ template <class F, class I>
 using MixedOp = typename MixedOp_<F, I>::type;
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_TYPE_TRAITS_H_
diff --git a/engine/src/flutter/impeller/geometry/vector.h b/engine/src/flutter/impeller/geometry/vector.h
index b319776ff2..eadf913297 100644
--- a/engine/src/flutter/impeller/geometry/vector.h
+++ b/engine/src/flutter/impeller/geometry/vector.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GEOMETRY_VECTOR_H_
+#define FLUTTER_IMPELLER_GEOMETRY_VECTOR_H_
 
 #include <cmath>
 #include <string>
@@ -329,3 +330,5 @@ inline std::ostream& operator<<(std::ostream& out, const impeller::Vector4& p) {
 // NOLINTEND(google-explicit-constructor)
 
 }  // namespace std
+
+#endif  // FLUTTER_IMPELLER_GEOMETRY_VECTOR_H_
diff --git a/engine/src/flutter/impeller/golden_tests/golden_digest.h b/engine/src/flutter/impeller/golden_tests/golden_digest.h
index 4ed422b8aa..aaa4e8fa00 100644
--- a/engine/src/flutter/impeller/golden_tests/golden_digest.h
+++ b/engine/src/flutter/impeller/golden_tests/golden_digest.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GOLDEN_TESTS_GOLDEN_DIGEST_H_
+#define FLUTTER_IMPELLER_GOLDEN_TESTS_GOLDEN_DIGEST_H_
 
 #include <map>
 #include <string>
@@ -51,3 +52,5 @@ class GoldenDigest {
 };
 }  // namespace testing
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GOLDEN_TESTS_GOLDEN_DIGEST_H_
diff --git a/engine/src/flutter/impeller/golden_tests/golden_playground_test.h b/engine/src/flutter/impeller/golden_tests/golden_playground_test.h
index 4488dea7bb..d28ee1f3ae 100644
--- a/engine/src/flutter/impeller/golden_tests/golden_playground_test.h
+++ b/engine/src/flutter/impeller/golden_tests/golden_playground_test.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GOLDEN_TESTS_GOLDEN_PLAYGROUND_TEST_H_
+#define FLUTTER_IMPELLER_GOLDEN_TESTS_GOLDEN_PLAYGROUND_TEST_H_
 
 #include <memory>
 
@@ -79,3 +80,5 @@ class GoldenPlaygroundTest
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GOLDEN_TESTS_GOLDEN_PLAYGROUND_TEST_H_
diff --git a/engine/src/flutter/impeller/golden_tests/metal_screenshot.h b/engine/src/flutter/impeller/golden_tests/metal_screenshot.h
index 3b4814746b..d2f9dab09b 100644
--- a/engine/src/flutter/impeller/golden_tests/metal_screenshot.h
+++ b/engine/src/flutter/impeller/golden_tests/metal_screenshot.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GOLDEN_TESTS_METAL_SCREENSHOT_H_
+#define FLUTTER_IMPELLER_GOLDEN_TESTS_METAL_SCREENSHOT_H_
 
 #include <CoreFoundation/CoreFoundation.h>
 #include <CoreImage/CoreImage.h>
@@ -39,3 +40,5 @@ class MetalScreenshot {
 };
 }  // namespace testing
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GOLDEN_TESTS_METAL_SCREENSHOT_H_
diff --git a/engine/src/flutter/impeller/golden_tests/metal_screenshotter.h b/engine/src/flutter/impeller/golden_tests/metal_screenshotter.h
index c013cf27d3..292053dd66 100644
--- a/engine/src/flutter/impeller/golden_tests/metal_screenshotter.h
+++ b/engine/src/flutter/impeller/golden_tests/metal_screenshotter.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GOLDEN_TESTS_METAL_SCREENSHOTTER_H_
+#define FLUTTER_IMPELLER_GOLDEN_TESTS_METAL_SCREENSHOTTER_H_
 
 #include "flutter/fml/macros.h"
 #include "flutter/impeller/aiks/picture.h"
@@ -32,3 +33,5 @@ class MetalScreenshotter {
 
 }  // namespace testing
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GOLDEN_TESTS_METAL_SCREENSHOTTER_H_
diff --git a/engine/src/flutter/impeller/golden_tests/working_directory.h b/engine/src/flutter/impeller/golden_tests/working_directory.h
index fc507c97a8..e6de4ef36f 100644
--- a/engine/src/flutter/impeller/golden_tests/working_directory.h
+++ b/engine/src/flutter/impeller/golden_tests/working_directory.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_GOLDEN_TESTS_WORKING_DIRECTORY_H_
+#define FLUTTER_IMPELLER_GOLDEN_TESTS_WORKING_DIRECTORY_H_
 
 #include <string>
 
@@ -35,3 +36,5 @@ class WorkingDirectory {
 
 }  // namespace testing
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_GOLDEN_TESTS_WORKING_DIRECTORY_H_
diff --git a/engine/src/flutter/impeller/image/backends/skia/compressed_image_skia.h b/engine/src/flutter/impeller/image/backends/skia/compressed_image_skia.h
index 4b940fdbf8..1db71c2bdb 100644
--- a/engine/src/flutter/impeller/image/backends/skia/compressed_image_skia.h
+++ b/engine/src/flutter/impeller/image/backends/skia/compressed_image_skia.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_IMAGE_BACKENDS_SKIA_COMPRESSED_IMAGE_SKIA_H_
+#define FLUTTER_IMPELLER_IMAGE_BACKENDS_SKIA_COMPRESSED_IMAGE_SKIA_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/image/compressed_image.h"
@@ -28,3 +29,5 @@ class CompressedImageSkia final : public CompressedImage {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_IMAGE_BACKENDS_SKIA_COMPRESSED_IMAGE_SKIA_H_
diff --git a/engine/src/flutter/impeller/image/compressed_image.h b/engine/src/flutter/impeller/image/compressed_image.h
index c758a632b9..69d69db81f 100644
--- a/engine/src/flutter/impeller/image/compressed_image.h
+++ b/engine/src/flutter/impeller/image/compressed_image.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_IMAGE_COMPRESSED_IMAGE_H_
+#define FLUTTER_IMPELLER_IMAGE_COMPRESSED_IMAGE_H_
 
 #include <memory>
 
@@ -30,3 +31,5 @@ class CompressedImage {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_IMAGE_COMPRESSED_IMAGE_H_
diff --git a/engine/src/flutter/impeller/image/decompressed_image.h b/engine/src/flutter/impeller/image/decompressed_image.h
index 56bf9b15c5..d6643b1a43 100644
--- a/engine/src/flutter/impeller/image/decompressed_image.h
+++ b/engine/src/flutter/impeller/image/decompressed_image.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_IMAGE_DECOMPRESSED_IMAGE_H_
+#define FLUTTER_IMPELLER_IMAGE_DECOMPRESSED_IMAGE_H_
 
 #include <memory>
 #include <optional>
@@ -49,3 +50,5 @@ class DecompressedImage {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_IMAGE_DECOMPRESSED_IMAGE_H_
diff --git a/engine/src/flutter/impeller/playground/backend/gles/playground_impl_gles.h b/engine/src/flutter/impeller/playground/backend/gles/playground_impl_gles.h
index c16547583c..d1e328230c 100644
--- a/engine/src/flutter/impeller/playground/backend/gles/playground_impl_gles.h
+++ b/engine/src/flutter/impeller/playground/backend/gles/playground_impl_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_PLAYGROUND_BACKEND_GLES_PLAYGROUND_IMPL_GLES_H_
+#define FLUTTER_IMPELLER_PLAYGROUND_BACKEND_GLES_PLAYGROUND_IMPL_GLES_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/playground/playground_impl.h"
@@ -39,3 +40,5 @@ class PlaygroundImplGLES final : public PlaygroundImpl {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_PLAYGROUND_BACKEND_GLES_PLAYGROUND_IMPL_GLES_H_
diff --git a/engine/src/flutter/impeller/playground/backend/metal/playground_impl_mtl.h b/engine/src/flutter/impeller/playground/backend/metal/playground_impl_mtl.h
index b9cf12cde4..937db7a753 100644
--- a/engine/src/flutter/impeller/playground/backend/metal/playground_impl_mtl.h
+++ b/engine/src/flutter/impeller/playground/backend/metal/playground_impl_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_PLAYGROUND_BACKEND_METAL_PLAYGROUND_IMPL_MTL_H_
+#define FLUTTER_IMPELLER_PLAYGROUND_BACKEND_METAL_PLAYGROUND_IMPL_MTL_H_
 
 #include <memory>
 
@@ -48,3 +49,5 @@ class PlaygroundImplMTL final : public PlaygroundImpl {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_PLAYGROUND_BACKEND_METAL_PLAYGROUND_IMPL_MTL_H_
diff --git a/engine/src/flutter/impeller/playground/backend/vulkan/playground_impl_vk.h b/engine/src/flutter/impeller/playground/backend/vulkan/playground_impl_vk.h
index 0fa614224a..eed479b859 100644
--- a/engine/src/flutter/impeller/playground/backend/vulkan/playground_impl_vk.h
+++ b/engine/src/flutter/impeller/playground/backend/vulkan/playground_impl_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_PLAYGROUND_BACKEND_VULKAN_PLAYGROUND_IMPL_VK_H_
+#define FLUTTER_IMPELLER_PLAYGROUND_BACKEND_VULKAN_PLAYGROUND_IMPL_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/playground/playground_impl.h"
@@ -46,3 +47,5 @@ class PlaygroundImplVK final : public PlaygroundImpl {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_PLAYGROUND_BACKEND_VULKAN_PLAYGROUND_IMPL_VK_H_
diff --git a/engine/src/flutter/impeller/playground/compute_playground_test.h b/engine/src/flutter/impeller/playground/compute_playground_test.h
index 3af883b66e..1d426a2ae7 100644
--- a/engine/src/flutter/impeller/playground/compute_playground_test.h
+++ b/engine/src/flutter/impeller/playground/compute_playground_test.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_PLAYGROUND_COMPUTE_PLAYGROUND_TEST_H_
+#define FLUTTER_IMPELLER_PLAYGROUND_COMPUTE_PLAYGROUND_TEST_H_
 
 #include <memory>
 
@@ -66,3 +67,5 @@ class ComputePlaygroundTest
              info) { return PlaygroundBackendToString(info.param); });
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_PLAYGROUND_COMPUTE_PLAYGROUND_TEST_H_
diff --git a/engine/src/flutter/impeller/playground/imgui/imgui_impl_impeller.h b/engine/src/flutter/impeller/playground/imgui/imgui_impl_impeller.h
index 8b60efc31b..cfb624a61c 100644
--- a/engine/src/flutter/impeller/playground/imgui/imgui_impl_impeller.h
+++ b/engine/src/flutter/impeller/playground/imgui/imgui_impl_impeller.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_PLAYGROUND_IMGUI_IMGUI_IMPL_IMPELLER_H_
+#define FLUTTER_IMPELLER_PLAYGROUND_IMGUI_IMGUI_IMPL_IMPELLER_H_
 
 #include <memory>
 
@@ -23,3 +24,5 @@ IMGUI_IMPL_API void ImGui_ImplImpeller_Shutdown();
 IMGUI_IMPL_API void ImGui_ImplImpeller_RenderDrawData(
     ImDrawData* draw_data,
     impeller::RenderPass& renderpass);
+
+#endif  // FLUTTER_IMPELLER_PLAYGROUND_IMGUI_IMGUI_IMPL_IMPELLER_H_
diff --git a/engine/src/flutter/impeller/playground/playground.h b/engine/src/flutter/impeller/playground/playground.h
index ee961485f0..c9de5cc9cc 100644
--- a/engine/src/flutter/impeller/playground/playground.h
+++ b/engine/src/flutter/impeller/playground/playground.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_PLAYGROUND_PLAYGROUND_H_
+#define FLUTTER_IMPELLER_PLAYGROUND_PLAYGROUND_H_
 
 #include <chrono>
 #include <memory>
@@ -113,3 +114,5 @@ class Playground {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_PLAYGROUND_PLAYGROUND_H_
diff --git a/engine/src/flutter/impeller/playground/playground_impl.h b/engine/src/flutter/impeller/playground/playground_impl.h
index 6f43819c6d..499859f625 100644
--- a/engine/src/flutter/impeller/playground/playground_impl.h
+++ b/engine/src/flutter/impeller/playground/playground_impl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_PLAYGROUND_PLAYGROUND_IMPL_H_
+#define FLUTTER_IMPELLER_PLAYGROUND_PLAYGROUND_IMPL_H_
 
 #include <memory>
 
@@ -44,3 +45,5 @@ class PlaygroundImpl {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_PLAYGROUND_PLAYGROUND_IMPL_H_
diff --git a/engine/src/flutter/impeller/playground/playground_test.h b/engine/src/flutter/impeller/playground/playground_test.h
index 7aba4ee891..2d2539afa4 100644
--- a/engine/src/flutter/impeller/playground/playground_test.h
+++ b/engine/src/flutter/impeller/playground/playground_test.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_PLAYGROUND_PLAYGROUND_TEST_H_
+#define FLUTTER_IMPELLER_PLAYGROUND_PLAYGROUND_TEST_H_
 
 #include <memory>
 
@@ -68,3 +69,5 @@ class PlaygroundTest : public Playground,
       });
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_PLAYGROUND_PLAYGROUND_TEST_H_
diff --git a/engine/src/flutter/impeller/playground/switches.h b/engine/src/flutter/impeller/playground/switches.h
index 662f7b153b..1e28a37b19 100644
--- a/engine/src/flutter/impeller/playground/switches.h
+++ b/engine/src/flutter/impeller/playground/switches.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_PLAYGROUND_SWITCHES_H_
+#define FLUTTER_IMPELLER_PLAYGROUND_SWITCHES_H_
 
 #include <chrono>
 #include <optional>
@@ -26,3 +27,5 @@ struct PlaygroundSwitches {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_PLAYGROUND_SWITCHES_H_
diff --git a/engine/src/flutter/impeller/playground/widgets.h b/engine/src/flutter/impeller/playground/widgets.h
index e80d960d70..59957451b1 100644
--- a/engine/src/flutter/impeller/playground/widgets.h
+++ b/engine/src/flutter/impeller/playground/widgets.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_PLAYGROUND_WIDGETS_H_
+#define FLUTTER_IMPELLER_PLAYGROUND_WIDGETS_H_
 
 #include <tuple>
 
@@ -73,3 +74,5 @@
                                                                          \
     std::make_tuple(position_a, position_b);                             \
   })
+
+#endif  // FLUTTER_IMPELLER_PLAYGROUND_WIDGETS_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/allocator_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/allocator_gles.h
index e36b3515b7..a78980382b 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/allocator_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/allocator_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_ALLOCATOR_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_ALLOCATOR_GLES_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/core/allocator.h"
@@ -43,3 +44,5 @@ class AllocatorGLES final : public Allocator {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_ALLOCATOR_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/blit_command_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/blit_command_gles.h
index 570b1f19d3..5fa9c802f3 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/blit_command_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/blit_command_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_BLIT_COMMAND_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_BLIT_COMMAND_GLES_H_
 
 #include "impeller/base/backend_cast.h"
 #include "impeller/renderer/backend/gles/reactor_gles.h"
@@ -49,3 +50,5 @@ struct BlitGenerateMipmapCommandGLES : public BlitEncodeGLES,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_BLIT_COMMAND_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/blit_pass_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/blit_pass_gles.h
index 857a9ca153..b38fa0da63 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/blit_pass_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/blit_pass_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_BLIT_PASS_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_BLIT_PASS_GLES_H_
 
 #include <memory>
 
@@ -72,3 +73,5 @@ class BlitPassGLES final : public BlitPass,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_BLIT_PASS_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/buffer_bindings_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/buffer_bindings_gles.h
index c30e4e631b..17f5a5a7b1 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/buffer_bindings_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/buffer_bindings_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_BUFFER_BINDINGS_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_BUFFER_BINDINGS_GLES_H_
 
 #include <unordered_map>
 #include <vector>
@@ -81,3 +82,5 @@ class BufferBindingsGLES {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_BUFFER_BINDINGS_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/capabilities_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/capabilities_gles.h
index 921d3a4287..baa6d76d37 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/capabilities_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/capabilities_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_CAPABILITIES_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_CAPABILITIES_GLES_H_
 
 #include <cstddef>
 
@@ -123,3 +124,5 @@ class CapabilitiesGLES final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_CAPABILITIES_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/command_buffer_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/command_buffer_gles.h
index 6cc4ff3c68..23441a1a78 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/command_buffer_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/command_buffer_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_COMMAND_BUFFER_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_COMMAND_BUFFER_GLES_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/renderer/backend/gles/reactor_gles.h"
@@ -52,3 +53,5 @@ class CommandBufferGLES final : public CommandBuffer {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_COMMAND_BUFFER_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/context_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/context_gles.h
index 5bfb5d3997..a81b10ec75 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/context_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/context_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_CONTEXT_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_CONTEXT_GLES_H_
 
 #include <thread>
 #include <unordered_map>
@@ -96,3 +97,5 @@ class ContextGLES final : public Context,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_CONTEXT_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/description_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/description_gles.h
index 1ef07ed36e..dac13cab61 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/description_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/description_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_DESCRIPTION_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_DESCRIPTION_GLES_H_
 
 #include <set>
 #include <string>
@@ -48,3 +49,5 @@ class DescriptionGLES {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_DESCRIPTION_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/device_buffer_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/device_buffer_gles.h
index 65661059ba..8aee746127 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/device_buffer_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/device_buffer_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_DEVICE_BUFFER_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_DEVICE_BUFFER_GLES_H_
 
 #include <cstdint>
 #include <memory>
@@ -65,3 +66,5 @@ class DeviceBufferGLES final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_DEVICE_BUFFER_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/formats_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/formats_gles.h
index b4296fbfe2..02adb19941 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/formats_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/formats_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_FORMATS_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_FORMATS_GLES_H_
 
 #include <optional>
 
@@ -197,3 +198,5 @@ constexpr std::optional<GLenum> ToTextureTarget(TextureType type) {
 std::string DebugToFramebufferError(int status);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_FORMATS_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/gles.h b/engine/src/flutter/impeller/renderer/backend/gles/gles.h
index 9022cd02cf..b3a512e0d2 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_GLES_H_
 
 // IWYU pragma: begin_exports
 #include "GLES3/gl3.h"
@@ -14,3 +15,5 @@
 #define GL_GLEXT_PROTOTYPES
 #include "GLES2/gl2ext.h"
 // IWYU pragma: end_exports
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/gpu_tracer_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/gpu_tracer_gles.h
index f0f4397480..f6b0de8ab9 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/gpu_tracer_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/gpu_tracer_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_GPU_TRACER_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_GPU_TRACER_GLES_H_
 
 #include <cstdint>
 #include <deque>
@@ -50,3 +51,5 @@ class GPUTracerGLES {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_GPU_TRACER_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/handle_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/handle_gles.h
index 3340310f41..a6fefd5923 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/handle_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/handle_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_HANDLE_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_HANDLE_GLES_H_
 
 #include <optional>
 #include <sstream>
@@ -89,3 +90,5 @@ inline std::ostream& operator<<(std::ostream& out,
 }
 
 }  // namespace std
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_HANDLE_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/pipeline_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/pipeline_gles.h
index 6ea8fe1102..9dfed8d807 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/pipeline_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/pipeline_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_PIPELINE_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_PIPELINE_GLES_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/base/backend_cast.h"
@@ -54,3 +55,5 @@ class PipelineGLES final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_PIPELINE_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/pipeline_library_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/pipeline_library_gles.h
index 74831525ae..410fcb991a 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/pipeline_library_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/pipeline_library_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_PIPELINE_LIBRARY_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_PIPELINE_LIBRARY_GLES_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/renderer/backend/gles/reactor_gles.h"
@@ -46,3 +47,5 @@ class PipelineLibraryGLES final : public PipelineLibrary {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_PIPELINE_LIBRARY_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/proc_table_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/proc_table_gles.h
index 03af427d8b..7e2bfd0f33 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/proc_table_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/proc_table_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_PROC_TABLE_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_PROC_TABLE_GLES_H_
 
 #include <functional>
 #include <string>
@@ -276,3 +277,5 @@ class ProcTableGLES {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_PROC_TABLE_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/reactor_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/reactor_gles.h
index 5922076943..eff7c34981 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/reactor_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/reactor_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_REACTOR_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_REACTOR_GLES_H_
 
 #include <functional>
 #include <memory>
@@ -271,3 +272,5 @@ class ReactorGLES {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_REACTOR_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/render_pass_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/render_pass_gles.h
index 30bcd7474e..2a003e6bdc 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/render_pass_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/render_pass_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_RENDER_PASS_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_RENDER_PASS_GLES_H_
 
 #include <memory>
 
@@ -45,3 +46,5 @@ class RenderPassGLES final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_RENDER_PASS_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/sampler_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/sampler_gles.h
index 62583054ac..58b7f66cd5 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/sampler_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/sampler_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SAMPLER_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SAMPLER_GLES_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/base/backend_cast.h"
@@ -36,3 +37,5 @@ class SamplerGLES final : public Sampler,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SAMPLER_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/sampler_library_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/sampler_library_gles.h
index 06e60c8594..47b5f429ce 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/sampler_library_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/sampler_library_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SAMPLER_LIBRARY_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SAMPLER_LIBRARY_GLES_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/core/sampler_descriptor.h"
@@ -35,3 +36,5 @@ class SamplerLibraryGLES final : public SamplerLibrary {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SAMPLER_LIBRARY_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/shader_function_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/shader_function_gles.h
index 1888bdfd2a..97bf2a49dc 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/shader_function_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/shader_function_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SHADER_FUNCTION_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SHADER_FUNCTION_GLES_H_
 
 #include <string>
 
@@ -40,3 +41,5 @@ class ShaderFunctionGLES final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SHADER_FUNCTION_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/shader_library_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/shader_library_gles.h
index b2acd22281..8c10a638c8 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/shader_library_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/shader_library_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SHADER_LIBRARY_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SHADER_LIBRARY_GLES_H_
 
 #include <memory>
 
@@ -52,3 +53,5 @@ class ShaderLibraryGLES final : public ShaderLibrary {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SHADER_LIBRARY_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/surface_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/surface_gles.h
index e4eb8bc891..1b040598d3 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/surface_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/surface_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SURFACE_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SURFACE_GLES_H_
 
 #include <functional>
 #include <memory>
@@ -42,3 +43,5 @@ class SurfaceGLES final : public Surface {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_SURFACE_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/gles/texture_gles.h b/engine/src/flutter/impeller/renderer/backend/gles/texture_gles.h
index 5ade7d3a0c..704d0ef3a8 100644
--- a/engine/src/flutter/impeller/renderer/backend/gles/texture_gles.h
+++ b/engine/src/flutter/impeller/renderer/backend/gles/texture_gles.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_TEXTURE_GLES_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_TEXTURE_GLES_H_
 
 #include "impeller/base/backend_cast.h"
 #include "impeller/core/texture.h"
@@ -95,3 +96,5 @@ class TextureGLES final : public Texture,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_TEXTURE_GLES_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/allocator_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/allocator_mtl.h
index fc0dc5ee62..2d097e16b8 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/allocator_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/allocator_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_ALLOCATOR_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_ALLOCATOR_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -53,3 +54,5 @@ class AllocatorMTL final : public Allocator {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_ALLOCATOR_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/blit_command_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/blit_command_mtl.h
index 86062e9c04..90dad19560 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/blit_command_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/blit_command_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_BLIT_COMMAND_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_BLIT_COMMAND_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -61,3 +62,5 @@ struct BlitCopyBufferToTextureCommandMTL
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_BLIT_COMMAND_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/blit_pass_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/blit_pass_mtl.h
index 4a2ef0caf8..68d0c2d409 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/blit_pass_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/blit_pass_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_BLIT_PASS_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_BLIT_PASS_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -68,3 +69,5 @@ class BlitPassMTL final : public BlitPass {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_BLIT_PASS_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/command_buffer_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/command_buffer_mtl.h
index 7e167fa2b3..735142b59a 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/command_buffer_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/command_buffer_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_COMMAND_BUFFER_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_COMMAND_BUFFER_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -59,3 +60,5 @@ class CommandBufferMTL final : public CommandBuffer {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_COMMAND_BUFFER_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/compute_pass_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/compute_pass_mtl.h
index 7c06e86478..812749639d 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/compute_pass_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/compute_pass_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_COMPUTE_PASS_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_COMPUTE_PASS_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -48,3 +49,5 @@ class ComputePassMTL final : public ComputePass {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_COMPUTE_PASS_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/compute_pipeline_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/compute_pipeline_mtl.h
index 39ca1b3bac..1ab1277c04 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/compute_pipeline_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/compute_pipeline_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_COMPUTE_PIPELINE_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_COMPUTE_PIPELINE_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -41,3 +42,5 @@ class ComputePipelineMTL final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_COMPUTE_PIPELINE_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/context_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/context_mtl.h
index 91b30a9c8a..a3ce8d7fa3 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/context_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/context_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_CONTEXT_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_CONTEXT_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -145,3 +146,5 @@ class ContextMTL final : public Context,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_CONTEXT_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/device_buffer_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/device_buffer_mtl.h
index 0547deaa7a..93e548895e 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/device_buffer_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/device_buffer_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_DEVICE_BUFFER_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_DEVICE_BUFFER_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -57,3 +58,5 @@ class DeviceBufferMTL final : public DeviceBuffer,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_DEVICE_BUFFER_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/formats_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/formats_mtl.h
index 95212ce7d6..f476688709 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/formats_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/formats_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_FORMATS_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_FORMATS_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -399,3 +400,5 @@ MTLDepthStencilDescriptor* ToMTLDepthStencilDescriptor(
 MTLTextureDescriptor* ToMTLTextureDescriptor(const TextureDescriptor& desc);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_FORMATS_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/gpu_tracer_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/gpu_tracer_mtl.h
index ac2c3916d0..94ada1b97d 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/gpu_tracer_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/gpu_tracer_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_GPU_TRACER_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_GPU_TRACER_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -46,3 +47,5 @@ class GPUTracerMTL : public std::enable_shared_from_this<GPUTracerMTL> {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_GPU_TRACER_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/lazy_drawable_holder.h b/engine/src/flutter/impeller/renderer/backend/metal/lazy_drawable_holder.h
index 5062e453e5..c01975b978 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/lazy_drawable_holder.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/lazy_drawable_holder.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_LAZY_DRAWABLE_HOLDER_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_LAZY_DRAWABLE_HOLDER_H_
 
 #include <Metal/Metal.h>
 
@@ -28,3 +29,5 @@ std::shared_ptr<TextureMTL> CreateTextureFromDrawableFuture(
     const std::shared_future<id<CAMetalDrawable>>& drawble_future);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_LAZY_DRAWABLE_HOLDER_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/pipeline_library_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/pipeline_library_mtl.h
index 06489545e9..7b12ebbd74 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/pipeline_library_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/pipeline_library_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_PIPELINE_LIBRARY_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_PIPELINE_LIBRARY_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -50,3 +51,5 @@ class PipelineLibraryMTL final : public PipelineLibrary {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_PIPELINE_LIBRARY_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/pipeline_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/pipeline_mtl.h
index d7a03d6b71..b9aca9df8a 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/pipeline_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/pipeline_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_PIPELINE_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_PIPELINE_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -44,3 +45,5 @@ class PipelineMTL final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_PIPELINE_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/render_pass_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/render_pass_mtl.h
index 6a3d7469df..69c78573e8 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/render_pass_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/render_pass_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_RENDER_PASS_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_RENDER_PASS_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -47,3 +48,5 @@ class RenderPassMTL final : public RenderPass {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_RENDER_PASS_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/sampler_library_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/sampler_library_mtl.h
index 84bf62e493..c787666572 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/sampler_library_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/sampler_library_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SAMPLER_LIBRARY_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SAMPLER_LIBRARY_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -41,3 +42,5 @@ class SamplerLibraryMTL final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SAMPLER_LIBRARY_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/sampler_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/sampler_mtl.h
index 55ee66b4a0..3a9a0fe6b2 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/sampler_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/sampler_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SAMPLER_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SAMPLER_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -40,3 +41,5 @@ class SamplerMTL final : public Sampler,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SAMPLER_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/shader_function_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/shader_function_mtl.h
index fc3008d36f..7375421b02 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/shader_function_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/shader_function_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SHADER_FUNCTION_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SHADER_FUNCTION_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -44,3 +45,5 @@ class ShaderFunctionMTL final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SHADER_FUNCTION_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/shader_library_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/shader_library_mtl.h
index c401696c7e..756cf5fe4c 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/shader_library_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/shader_library_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SHADER_LIBRARY_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SHADER_LIBRARY_MTL_H_
 
 #include <Foundation/Foundation.h>
 #include <Metal/Metal.h>
@@ -64,3 +65,5 @@ class ShaderLibraryMTL final : public ShaderLibrary {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SHADER_LIBRARY_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/surface_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/surface_mtl.h
index 1a21d72eef..a933ecff87 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/surface_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/surface_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SURFACE_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SURFACE_MTL_H_
 
 #include <QuartzCore/CAMetalLayer.h>
 #include <memory>
@@ -87,3 +88,5 @@ class SurfaceMTL final : public Surface {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SURFACE_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/texture_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/texture_mtl.h
index 632b0491e5..0e6992af5b 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/texture_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/texture_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_TEXTURE_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_TEXTURE_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -73,3 +74,5 @@ class TextureMTL final : public Texture,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_TEXTURE_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/texture_wrapper_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/texture_wrapper_mtl.h
index e6fe71f0f2..1402bd79dc 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/texture_wrapper_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/texture_wrapper_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_TEXTURE_WRAPPER_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_TEXTURE_WRAPPER_MTL_H_
 
 #include "impeller/core/texture.h"
 
@@ -14,3 +15,5 @@ std::shared_ptr<Texture> WrapTextureMTL(
     std::function<void()> deletion_proc = nullptr);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_TEXTURE_WRAPPER_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/metal/vertex_descriptor_mtl.h b/engine/src/flutter/impeller/renderer/backend/metal/vertex_descriptor_mtl.h
index e153e2f149..65c4a9545c 100644
--- a/engine/src/flutter/impeller/renderer/backend/metal/vertex_descriptor_mtl.h
+++ b/engine/src/flutter/impeller/renderer/backend/metal/vertex_descriptor_mtl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_VERTEX_DESCRIPTOR_MTL_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_VERTEX_DESCRIPTOR_MTL_H_
 
 #include <Metal/Metal.h>
 
@@ -35,3 +36,5 @@ class VertexDescriptorMTL {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_VERTEX_DESCRIPTOR_MTL_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/allocator_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/allocator_vk.h
index 1977b79115..51be4d8eb9 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/allocator_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/allocator_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_ALLOCATOR_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_ALLOCATOR_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "flutter/fml/memory/ref_ptr.h"
@@ -69,3 +70,5 @@ class AllocatorVK final : public Allocator {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_ALLOCATOR_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/android_hardware_buffer_texture_source_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/android_hardware_buffer_texture_source_vk.h
index 7580c4ff60..1efe7fa52a 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/android_hardware_buffer_texture_source_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/android_hardware_buffer_texture_source_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_ANDROID_HARDWARE_BUFFER_TEXTURE_SOURCE_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_ANDROID_HARDWARE_BUFFER_TEXTURE_SOURCE_VK_H_
 
 #include "flutter/fml/build_config.h"
 #include "vulkan/vulkan_core.h"
@@ -57,3 +58,5 @@ class AndroidHardwareBufferTextureSourceVK final : public TextureSourceVK {
 }  // namespace impeller
 
 #endif
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_ANDROID_HARDWARE_BUFFER_TEXTURE_SOURCE_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/barrier_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/barrier_vk.h
index 9dc7bd0268..b4bc225789 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/barrier_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/barrier_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_BARRIER_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_BARRIER_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/renderer/backend/vulkan/vk.h"
@@ -43,3 +44,5 @@ struct BarrierVK {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_BARRIER_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/binding_helpers_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/binding_helpers_vk.h
index 14d3145a8d..b232d360cf 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/binding_helpers_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/binding_helpers_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_BINDING_HELPERS_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_BINDING_HELPERS_VK_H_
 
 #include <vector>
 
@@ -26,3 +27,5 @@ fml::StatusOr<std::vector<vk::DescriptorSet>> AllocateAndBindDescriptorSets(
     const std::vector<ComputeCommand>& commands);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_BINDING_HELPERS_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/blit_command_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/blit_command_vk.h
index dbbf588155..7fa7589e55 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/blit_command_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/blit_command_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_BLIT_COMMAND_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_BLIT_COMMAND_VK_H_
 
 #include <memory>
 #include "impeller/base/backend_cast.h"
@@ -62,3 +63,5 @@ struct BlitGenerateMipmapCommandVK : public BlitGenerateMipmapCommand,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_BLIT_COMMAND_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/blit_pass_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/blit_pass_vk.h
index 1175dcab96..2fc0c26380 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/blit_pass_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/blit_pass_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_BLIT_PASS_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_BLIT_PASS_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "flutter/impeller/base/config.h"
@@ -67,3 +68,5 @@ class BlitPassVK final : public BlitPass {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_BLIT_PASS_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/capabilities_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/capabilities_vk.h
index eb9eb08a6f..4cb7ce8996 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/capabilities_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/capabilities_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_CAPABILITIES_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_CAPABILITIES_VK_H_
 
 #include <cstdint>
 #include <map>
@@ -124,3 +125,5 @@ class CapabilitiesVK final : public Capabilities,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_CAPABILITIES_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/command_buffer_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/command_buffer_vk.h
index 405aba0b57..b1ede05b72 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/command_buffer_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/command_buffer_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMMAND_BUFFER_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMMAND_BUFFER_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/base/backend_cast.h"
@@ -61,3 +62,5 @@ class CommandBufferVK final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMMAND_BUFFER_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/command_encoder_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/command_encoder_vk.h
index 5455647b74..612c63f213 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/command_encoder_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/command_encoder_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMMAND_ENCODER_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMMAND_ENCODER_VK_H_
 
 #include <cstdint>
 #include <functional>
@@ -104,3 +105,5 @@ class CommandEncoderVK {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMMAND_ENCODER_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/command_pool_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/command_pool_vk.h
index 04a7990401..6fb1bcadcd 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/command_pool_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/command_pool_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMMAND_POOL_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMMAND_POOL_VK_H_
 
 #include <memory>
 #include <optional>
@@ -146,3 +147,5 @@ class CommandPoolRecyclerVK final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMMAND_POOL_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/compute_pass_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/compute_pass_vk.h
index 0944e9529f..caf88577bc 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/compute_pass_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/compute_pass_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMPUTE_PASS_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMPUTE_PASS_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/renderer/backend/vulkan/command_encoder_vk.h"
@@ -39,4 +40,5 @@ class ComputePassVK final : public ComputePass {
                         const ISize& thread_group_size) const override;
 };
 
-}  // namespace impeller
\ No newline at end of file
+}  // namespace impeller
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMPUTE_PASS_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/compute_pipeline_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/compute_pipeline_vk.h
index bf6d53a2f9..3ad7117b45 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/compute_pipeline_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/compute_pipeline_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMPUTE_PIPELINE_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMPUTE_PIPELINE_VK_H_
 
 #include <memory>
 
@@ -53,3 +54,5 @@ class ComputePipelineVK final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_COMPUTE_PIPELINE_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/context_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/context_vk.h
index 33bfcfa346..2bb9927dca 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/context_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/context_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_CONTEXT_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_CONTEXT_VK_H_
 
 #include <memory>
 
@@ -216,3 +217,5 @@ class ContextVK final : public Context,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_CONTEXT_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/debug_report_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/debug_report_vk.h
index a81d0a27a5..b6ca88f3f4 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/debug_report_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/debug_report_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_DEBUG_REPORT_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_DEBUG_REPORT_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/renderer/backend/vulkan/vk.h"
@@ -44,3 +45,5 @@ class DebugReportVK {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_DEBUG_REPORT_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/descriptor_pool_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/descriptor_pool_vk.h
index 8d2fb7c45c..f4965ec224 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/descriptor_pool_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/descriptor_pool_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_DESCRIPTOR_POOL_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_DESCRIPTOR_POOL_VK_H_
 
 #include <cstdint>
 
@@ -119,3 +120,5 @@ class DescriptorPoolRecyclerVK final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_DESCRIPTOR_POOL_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/device_buffer_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/device_buffer_vk.h
index 70022dd40d..c2e617dff3 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/device_buffer_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/device_buffer_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_DEVICE_BUFFER_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_DEVICE_BUFFER_VK_H_
 
 #include <memory>
 
@@ -74,3 +75,5 @@ class DeviceBufferVK final : public DeviceBuffer,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_DEVICE_BUFFER_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/device_holder.h b/engine/src/flutter/impeller/renderer/backend/vulkan/device_holder.h
index f113cbc331..bd26e09e20 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/device_holder.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/device_holder.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_DEVICE_HOLDER_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_DEVICE_HOLDER_H_
 
 #include "impeller/renderer/backend/vulkan/vk.h"  // IWYU pragma: keep.
 
@@ -16,3 +17,5 @@ class DeviceHolder {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_DEVICE_HOLDER_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/fence_waiter_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/fence_waiter_vk.h
index c58c9e0783..eb32e3a655 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/fence_waiter_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/fence_waiter_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_FENCE_WAITER_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_FENCE_WAITER_VK_H_
 
 #include <condition_variable>
 #include <memory>
@@ -56,3 +57,5 @@ class FenceWaiterVK {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_FENCE_WAITER_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/formats_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/formats_vk.h
index 42fca4f9a6..bf0ce5fb6a 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/formats_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/formats_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_FORMATS_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_FORMATS_VK_H_
 
 #include <cstdint>
 
@@ -665,3 +666,5 @@ constexpr vk::ImageAspectFlags ToImageAspectFlags(PixelFormat format) {
 }
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_FORMATS_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/limits_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/limits_vk.h
index 14e2dce906..4303d7d94d 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/limits_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/limits_vk.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_LIMITS_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_LIMITS_VK_H_
 
 #include <stdint.h>
 
@@ -12,3 +13,5 @@ constexpr size_t kImageSizeThresholdForDedicatedMemoryAllocation =
     4 * 1024 * 1024;
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_LIMITS_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/pass_bindings_cache.h b/engine/src/flutter/impeller/renderer/backend/vulkan/pass_bindings_cache.h
index 22b3a0e463..9eccee0ee0 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/pass_bindings_cache.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/pass_bindings_cache.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_PASS_BINDINGS_CACHE_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_PASS_BINDINGS_CACHE_H_
 
 #include <cstdint>
 #include <optional>
@@ -45,3 +46,5 @@ class PassBindingsCache {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_PASS_BINDINGS_CACHE_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/pipeline_cache_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/pipeline_cache_vk.h
index 070d636ab0..398b5f2555 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/pipeline_cache_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/pipeline_cache_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_PIPELINE_CACHE_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_PIPELINE_CACHE_VK_H_
 
 #include "flutter/fml/file.h"
 #include "flutter/fml/macros.h"
@@ -48,3 +49,5 @@ class PipelineCacheVK {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_PIPELINE_CACHE_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/pipeline_library_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/pipeline_library_vk.h
index 923dad397a..7866b4909d 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/pipeline_library_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/pipeline_library_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_PIPELINE_LIBRARY_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_PIPELINE_LIBRARY_VK_H_
 
 #include <atomic>
 
@@ -80,3 +81,5 @@ class PipelineLibraryVK final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_PIPELINE_LIBRARY_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/pipeline_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/pipeline_vk.h
index 0b6b3b6e03..ffe245152c 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/pipeline_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/pipeline_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_PIPELINE_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_PIPELINE_VK_H_
 
 #include <memory>
 
@@ -55,3 +56,5 @@ class PipelineVK final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_PIPELINE_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/queue_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/queue_vk.h
index 8fde3b712a..7345429b6d 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/queue_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/queue_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_QUEUE_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_QUEUE_VK_H_
 
 #include <memory>
 
@@ -72,3 +73,5 @@ struct QueuesVK {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_QUEUE_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/render_pass_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/render_pass_vk.h
index b7164d9d6c..a173aafe35 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/render_pass_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/render_pass_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_RENDER_PASS_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_RENDER_PASS_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/renderer/backend/vulkan/context_vk.h"
@@ -56,3 +57,5 @@ class RenderPassVK final : public RenderPass {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_RENDER_PASS_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/resource_manager_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/resource_manager_vk.h
index 088314e3e8..4d8ef36a1c 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/resource_manager_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/resource_manager_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_RESOURCE_MANAGER_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_RESOURCE_MANAGER_VK_H_
 
 #include <condition_variable>
 #include <memory>
@@ -208,3 +209,5 @@ class UniqueResourceVKT final {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_RESOURCE_MANAGER_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/sampler_library_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/sampler_library_vk.h
index 3be467040b..a18e65ef15 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/sampler_library_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/sampler_library_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SAMPLER_LIBRARY_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SAMPLER_LIBRARY_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/base/backend_cast.h"
@@ -39,3 +40,5 @@ class SamplerLibraryVK final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SAMPLER_LIBRARY_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/sampler_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/sampler_vk.h
index 3cc48a229f..871f3699d4 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/sampler_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/sampler_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SAMPLER_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SAMPLER_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/base/backend_cast.h"
@@ -40,3 +41,5 @@ class SamplerVK final : public Sampler, public BackendCast<SamplerVK, Sampler> {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SAMPLER_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/shader_function_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/shader_function_vk.h
index 713a4fded6..1d7505707d 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/shader_function_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/shader_function_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SHADER_FUNCTION_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SHADER_FUNCTION_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/base/backend_cast.h"
@@ -40,3 +41,5 @@ class ShaderFunctionVK final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SHADER_FUNCTION_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/shader_library_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/shader_library_vk.h
index 67e266aa80..ea3f063a25 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/shader_library_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/shader_library_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SHADER_LIBRARY_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SHADER_LIBRARY_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/base/comparable.h"
@@ -57,3 +58,5 @@ class ShaderLibraryVK final : public ShaderLibrary {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SHADER_LIBRARY_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/shared_object_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/shared_object_vk.h
index f91f018c94..7b4bbdce86 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/shared_object_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/shared_object_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SHARED_OBJECT_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SHARED_OBJECT_VK_H_
 
 #include <memory>
 
@@ -51,3 +52,5 @@ template <class T>
 using SharedHandleVK = std::shared_ptr<SharedObjectVKT<T>>;
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SHARED_OBJECT_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/surface_context_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/surface_context_vk.h
index 9bb6548480..5c8a327685 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/surface_context_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/surface_context_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SURFACE_CONTEXT_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SURFACE_CONTEXT_VK_H_
 
 #include <memory>
 
@@ -71,3 +72,5 @@ class SurfaceContextVK : public Context,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SURFACE_CONTEXT_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/surface_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/surface_vk.h
index 510923252f..fef4187f3e 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/surface_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/surface_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SURFACE_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SURFACE_VK_H_
 
 #include <memory>
 
@@ -39,3 +40,5 @@ class SurfaceVK final : public Surface {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SURFACE_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/swapchain_image_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/swapchain_image_vk.h
index 2eb1dc8d54..9ad316a8ec 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/swapchain_image_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/swapchain_image_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_IMAGE_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_IMAGE_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/geometry/size.h"
@@ -51,3 +52,5 @@ class SwapchainImageVK final : public TextureSourceVK {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_IMAGE_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/swapchain_impl_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/swapchain_impl_vk.h
index f8ce74e120..87ed948b21 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/swapchain_impl_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/swapchain_impl_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_IMPL_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_IMPL_VK_H_
 
 #include <cstdint>
 #include <memory>
@@ -90,3 +91,5 @@ class SwapchainImplVK final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_IMPL_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/swapchain_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/swapchain_vk.h
index c69e5df46c..2e724bae8f 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/swapchain_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/swapchain_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_VK_H_
 
 #include <memory>
 
@@ -46,3 +47,5 @@ class SwapchainVK {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/test/mock_vulkan.h b/engine/src/flutter/impeller/renderer/backend/vulkan/test/mock_vulkan.h
index e48764d5bf..4c68492c5c 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/test/mock_vulkan.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/test/mock_vulkan.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_TEST_MOCK_VULKAN_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_TEST_MOCK_VULKAN_H_
 
 #include <functional>
 #include <memory>
@@ -95,3 +96,5 @@ class MockVulkanContextBuilder {
 
 }  // namespace testing
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_TEST_MOCK_VULKAN_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/texture_source_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/texture_source_vk.h
index eaab485655..13f475b5df 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/texture_source_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/texture_source_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_TEXTURE_SOURCE_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_TEXTURE_SOURCE_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "flutter/fml/status.h"
@@ -62,3 +63,5 @@ class TextureSourceVK {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_TEXTURE_SOURCE_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/texture_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/texture_vk.h
index fe3d13890d..4df1dcc37b 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/texture_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/texture_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_TEXTURE_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_TEXTURE_VK_H_
 
 #include <variant>
 
@@ -65,3 +66,5 @@ class TextureVK final : public Texture, public BackendCast<TextureVK, Texture> {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_TEXTURE_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/vertex_descriptor_vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/vertex_descriptor_vk.h
index 31d3f447c7..1768211fbe 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/vertex_descriptor_vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/vertex_descriptor_vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_VERTEX_DESCRIPTOR_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_VERTEX_DESCRIPTOR_VK_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/core/shader_types.h"
@@ -13,3 +14,5 @@ namespace impeller {
 vk::Format ToVertexDescriptorFormat(const ShaderStageIOSlot& input);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_VERTEX_DESCRIPTOR_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/vk.h b/engine/src/flutter/impeller/renderer/backend/vulkan/vk.h
index 9c17b82725..ea992ce0e2 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/vk.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/vk.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_VK_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_VK_H_
 
 #include "flutter/fml/build_config.h"
 #include "flutter/fml/logging.h"
@@ -68,3 +69,5 @@
 #include "vulkan/vulkan.hpp"  // IWYU pragma: keep.
 
 static_assert(VK_HEADER_VERSION >= 215, "Vulkan headers must not be too old.");
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_VK_H_
diff --git a/engine/src/flutter/impeller/renderer/backend/vulkan/vma.h b/engine/src/flutter/impeller/renderer/backend/vulkan/vma.h
index f33a396997..6787bee93c 100644
--- a/engine/src/flutter/impeller/renderer/backend/vulkan/vma.h
+++ b/engine/src/flutter/impeller/renderer/backend/vulkan/vma.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_VMA_H_
+#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_VMA_H_
 
 #include "flutter/flutter_vma/flutter_vma.h"
 #include "flutter/fml/trace_event.h"
@@ -132,3 +133,5 @@ struct ImageVMATraits {
 using UniqueImageVMA = fml::UniqueObject<ImageVMA, ImageVMATraits>;
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_VMA_H_
diff --git a/engine/src/flutter/impeller/renderer/blit_command.h b/engine/src/flutter/impeller/renderer/blit_command.h
index 90124b58d8..7f456f6593 100644
--- a/engine/src/flutter/impeller/renderer/blit_command.h
+++ b/engine/src/flutter/impeller/renderer/blit_command.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BLIT_COMMAND_H_
+#define FLUTTER_IMPELLER_RENDERER_BLIT_COMMAND_H_
 
 #include "impeller/core/device_buffer.h"
 #include "impeller/core/texture.h"
@@ -39,3 +40,5 @@ struct BlitGenerateMipmapCommand : public BlitCommand {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BLIT_COMMAND_H_
diff --git a/engine/src/flutter/impeller/renderer/blit_pass.h b/engine/src/flutter/impeller/renderer/blit_pass.h
index 8f6b071be6..61f53b49dc 100644
--- a/engine/src/flutter/impeller/renderer/blit_pass.h
+++ b/engine/src/flutter/impeller/renderer/blit_pass.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_BLIT_PASS_H_
+#define FLUTTER_IMPELLER_RENDERER_BLIT_PASS_H_
 
 #include <string>
 #include <variant>
@@ -163,3 +164,5 @@ class BlitPass {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_BLIT_PASS_H_
diff --git a/engine/src/flutter/impeller/renderer/capabilities.h b/engine/src/flutter/impeller/renderer/capabilities.h
index 48f12a7d24..9f3f15cefe 100644
--- a/engine/src/flutter/impeller/renderer/capabilities.h
+++ b/engine/src/flutter/impeller/renderer/capabilities.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_CAPABILITIES_H_
+#define FLUTTER_IMPELLER_RENDERER_CAPABILITIES_H_
 
 #include <memory>
 
@@ -167,3 +168,5 @@ class CapabilitiesBuilder {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_CAPABILITIES_H_
diff --git a/engine/src/flutter/impeller/renderer/command.h b/engine/src/flutter/impeller/renderer/command.h
index 6351a4599d..426b444cb9 100644
--- a/engine/src/flutter/impeller/renderer/command.h
+++ b/engine/src/flutter/impeller/renderer/command.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_COMMAND_H_
+#define FLUTTER_IMPELLER_RENDERER_COMMAND_H_
 
 #include <cstdint>
 #include <map>
@@ -189,3 +190,5 @@ struct Command : public ResourceBinder {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_COMMAND_H_
diff --git a/engine/src/flutter/impeller/renderer/command_buffer.h b/engine/src/flutter/impeller/renderer/command_buffer.h
index 61717d2922..bbc0288cb7 100644
--- a/engine/src/flutter/impeller/renderer/command_buffer.h
+++ b/engine/src/flutter/impeller/renderer/command_buffer.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_COMMAND_BUFFER_H_
+#define FLUTTER_IMPELLER_RENDERER_COMMAND_BUFFER_H_
 
 #include <functional>
 #include <memory>
@@ -148,3 +149,5 @@ class CommandBuffer {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_COMMAND_BUFFER_H_
diff --git a/engine/src/flutter/impeller/renderer/compute_command.h b/engine/src/flutter/impeller/renderer/compute_command.h
index 1a2d515036..fb2639df66 100644
--- a/engine/src/flutter/impeller/renderer/compute_command.h
+++ b/engine/src/flutter/impeller/renderer/compute_command.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_COMPUTE_COMMAND_H_
+#define FLUTTER_IMPELLER_RENDERER_COMPUTE_COMMAND_H_
 
 #include <memory>
 #include <string>
@@ -69,3 +70,5 @@ struct ComputeCommand : public ResourceBinder {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_COMPUTE_COMMAND_H_
diff --git a/engine/src/flutter/impeller/renderer/compute_pass.h b/engine/src/flutter/impeller/renderer/compute_pass.h
index 37358ded6f..155f36e4b9 100644
--- a/engine/src/flutter/impeller/renderer/compute_pass.h
+++ b/engine/src/flutter/impeller/renderer/compute_pass.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_COMPUTE_PASS_H_
+#define FLUTTER_IMPELLER_RENDERER_COMPUTE_PASS_H_
 
 #include <string>
 #include <variant>
@@ -80,3 +81,5 @@ class ComputePass {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_COMPUTE_PASS_H_
diff --git a/engine/src/flutter/impeller/renderer/compute_pipeline_builder.h b/engine/src/flutter/impeller/renderer/compute_pipeline_builder.h
index 7a7d34cbce..8029c0ff9a 100644
--- a/engine/src/flutter/impeller/renderer/compute_pipeline_builder.h
+++ b/engine/src/flutter/impeller/renderer/compute_pipeline_builder.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_COMPUTE_PIPELINE_BUILDER_H_
+#define FLUTTER_IMPELLER_RENDERER_COMPUTE_PIPELINE_BUILDER_H_
 
 #include "flutter/fml/logging.h"
 #include "flutter/fml/macros.h"
@@ -83,3 +84,5 @@ struct ComputePipelineBuilder {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_COMPUTE_PIPELINE_BUILDER_H_
diff --git a/engine/src/flutter/impeller/renderer/compute_pipeline_descriptor.h b/engine/src/flutter/impeller/renderer/compute_pipeline_descriptor.h
index 8a38f12d4f..a92def4c78 100644
--- a/engine/src/flutter/impeller/renderer/compute_pipeline_descriptor.h
+++ b/engine/src/flutter/impeller/renderer/compute_pipeline_descriptor.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_COMPUTE_PIPELINE_DESCRIPTOR_H_
+#define FLUTTER_IMPELLER_RENDERER_COMPUTE_PIPELINE_DESCRIPTOR_H_
 
 #include <functional>
 #include <future>
@@ -66,3 +67,5 @@ class ComputePipelineDescriptor final
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_COMPUTE_PIPELINE_DESCRIPTOR_H_
diff --git a/engine/src/flutter/impeller/renderer/compute_tessellator.h b/engine/src/flutter/impeller/renderer/compute_tessellator.h
index 0b95c1044c..f8ccd0d8df 100644
--- a/engine/src/flutter/impeller/renderer/compute_tessellator.h
+++ b/engine/src/flutter/impeller/renderer/compute_tessellator.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_COMPUTE_TESSELLATOR_H_
+#define FLUTTER_IMPELLER_RENDERER_COMPUTE_TESSELLATOR_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/core/buffer_view.h"
@@ -84,3 +85,5 @@ class ComputeTessellator {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_COMPUTE_TESSELLATOR_H_
diff --git a/engine/src/flutter/impeller/renderer/context.h b/engine/src/flutter/impeller/renderer/context.h
index 9a24e435af..36ad0c2e18 100644
--- a/engine/src/flutter/impeller/renderer/context.h
+++ b/engine/src/flutter/impeller/renderer/context.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_CONTEXT_H_
+#define FLUTTER_IMPELLER_RENDERER_CONTEXT_H_
 
 #include <memory>
 #include <string>
@@ -211,3 +212,5 @@ class Context {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_CONTEXT_H_
diff --git a/engine/src/flutter/impeller/renderer/pipeline.h b/engine/src/flutter/impeller/renderer/pipeline.h
index 1c761c0a6f..63d0918b78 100644
--- a/engine/src/flutter/impeller/renderer/pipeline.h
+++ b/engine/src/flutter/impeller/renderer/pipeline.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_PIPELINE_H_
+#define FLUTTER_IMPELLER_RENDERER_PIPELINE_H_
 
 #include <future>
 
@@ -170,3 +171,5 @@ class ComputePipelineT {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_PIPELINE_H_
diff --git a/engine/src/flutter/impeller/renderer/pipeline_builder.h b/engine/src/flutter/impeller/renderer/pipeline_builder.h
index 163ce66e6f..9b2fadca83 100644
--- a/engine/src/flutter/impeller/renderer/pipeline_builder.h
+++ b/engine/src/flutter/impeller/renderer/pipeline_builder.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_PIPELINE_BUILDER_H_
+#define FLUTTER_IMPELLER_RENDERER_PIPELINE_BUILDER_H_
 
 #include "flutter/fml/logging.h"
 #include "flutter/fml/macros.h"
@@ -120,3 +121,5 @@ struct PipelineBuilder {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_PIPELINE_BUILDER_H_
diff --git a/engine/src/flutter/impeller/renderer/pipeline_descriptor.h b/engine/src/flutter/impeller/renderer/pipeline_descriptor.h
index 30149a0524..460d7e1ee8 100644
--- a/engine/src/flutter/impeller/renderer/pipeline_descriptor.h
+++ b/engine/src/flutter/impeller/renderer/pipeline_descriptor.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_PIPELINE_DESCRIPTOR_H_
+#define FLUTTER_IMPELLER_RENDERER_PIPELINE_DESCRIPTOR_H_
 
 #include <map>
 #include <memory>
@@ -167,3 +168,5 @@ class PipelineDescriptor final : public Comparable<PipelineDescriptor> {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_PIPELINE_DESCRIPTOR_H_
diff --git a/engine/src/flutter/impeller/renderer/pipeline_library.h b/engine/src/flutter/impeller/renderer/pipeline_library.h
index 3769f800ca..d97861f5dc 100644
--- a/engine/src/flutter/impeller/renderer/pipeline_library.h
+++ b/engine/src/flutter/impeller/renderer/pipeline_library.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_PIPELINE_LIBRARY_H_
+#define FLUTTER_IMPELLER_RENDERER_PIPELINE_LIBRARY_H_
 
 #include <optional>
 
@@ -57,3 +58,5 @@ class PipelineLibrary : public std::enable_shared_from_this<PipelineLibrary> {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_PIPELINE_LIBRARY_H_
diff --git a/engine/src/flutter/impeller/renderer/pool.h b/engine/src/flutter/impeller/renderer/pool.h
index 631284ff87..399236fd23 100644
--- a/engine/src/flutter/impeller/renderer/pool.h
+++ b/engine/src/flutter/impeller/renderer/pool.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_POOL_H_
+#define FLUTTER_IMPELLER_RENDERER_POOL_H_
 
 #include <cstdint>
 #include <memory>
@@ -53,3 +54,5 @@ class Pool {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_POOL_H_
diff --git a/engine/src/flutter/impeller/renderer/render_pass.h b/engine/src/flutter/impeller/renderer/render_pass.h
index 512c152d6e..ff0d6d50c9 100644
--- a/engine/src/flutter/impeller/renderer/render_pass.h
+++ b/engine/src/flutter/impeller/renderer/render_pass.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_RENDER_PASS_H_
+#define FLUTTER_IMPELLER_RENDERER_RENDER_PASS_H_
 
 #include <string>
 
@@ -114,3 +115,5 @@ class RenderPass {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_RENDER_PASS_H_
diff --git a/engine/src/flutter/impeller/renderer/render_target.h b/engine/src/flutter/impeller/renderer/render_target.h
index d808f9feef..dbd115a5c7 100644
--- a/engine/src/flutter/impeller/renderer/render_target.h
+++ b/engine/src/flutter/impeller/renderer/render_target.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_RENDER_TARGET_H_
+#define FLUTTER_IMPELLER_RENDERER_RENDER_TARGET_H_
 
 #include <functional>
 #include <map>
@@ -156,3 +157,5 @@ class RenderTarget final {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_RENDER_TARGET_H_
diff --git a/engine/src/flutter/impeller/renderer/renderer.h b/engine/src/flutter/impeller/renderer/renderer.h
index 552a49d724..1e37761ab4 100644
--- a/engine/src/flutter/impeller/renderer/renderer.h
+++ b/engine/src/flutter/impeller/renderer/renderer.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_RENDERER_H_
+#define FLUTTER_IMPELLER_RENDERER_RENDERER_H_
 
 #include <functional>
 #include <memory>
@@ -47,3 +48,5 @@ class Renderer {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_RENDERER_H_
diff --git a/engine/src/flutter/impeller/renderer/sampler_library.h b/engine/src/flutter/impeller/renderer/sampler_library.h
index f022488ce1..86e98b938b 100644
--- a/engine/src/flutter/impeller/renderer/sampler_library.h
+++ b/engine/src/flutter/impeller/renderer/sampler_library.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_SAMPLER_LIBRARY_H_
+#define FLUTTER_IMPELLER_RENDERER_SAMPLER_LIBRARY_H_
 
 #include "impeller/core/sampler.h"
 #include "impeller/core/sampler_descriptor.h"
@@ -26,3 +27,5 @@ class SamplerLibrary {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_SAMPLER_LIBRARY_H_
diff --git a/engine/src/flutter/impeller/renderer/shader_function.h b/engine/src/flutter/impeller/renderer/shader_function.h
index 280c64d117..d762dd2ea5 100644
--- a/engine/src/flutter/impeller/renderer/shader_function.h
+++ b/engine/src/flutter/impeller/renderer/shader_function.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_SHADER_FUNCTION_H_
+#define FLUTTER_IMPELLER_RENDERER_SHADER_FUNCTION_H_
 
 #include <string>
 #include "flutter/fml/hash_combine.h"
@@ -43,3 +44,5 @@ class ShaderFunction : public Comparable<ShaderFunction> {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_SHADER_FUNCTION_H_
diff --git a/engine/src/flutter/impeller/renderer/shader_key.h b/engine/src/flutter/impeller/renderer/shader_key.h
index 802908647b..77f03cff73 100644
--- a/engine/src/flutter/impeller/renderer/shader_key.h
+++ b/engine/src/flutter/impeller/renderer/shader_key.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_SHADER_KEY_H_
+#define FLUTTER_IMPELLER_RENDERER_SHADER_KEY_H_
 
 #include <memory>
 #include <string>
@@ -43,3 +44,5 @@ using ShaderFunctionMap =
                        ShaderKey::Equal>;
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_SHADER_KEY_H_
diff --git a/engine/src/flutter/impeller/renderer/shader_library.h b/engine/src/flutter/impeller/renderer/shader_library.h
index dd191f4994..a28817c2d1 100644
--- a/engine/src/flutter/impeller/renderer/shader_library.h
+++ b/engine/src/flutter/impeller/renderer/shader_library.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_SHADER_LIBRARY_H_
+#define FLUTTER_IMPELLER_RENDERER_SHADER_LIBRARY_H_
 
 #include <future>
 #include <memory>
@@ -45,3 +46,5 @@ class ShaderLibrary : public std::enable_shared_from_this<ShaderLibrary> {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_SHADER_LIBRARY_H_
diff --git a/engine/src/flutter/impeller/renderer/snapshot.h b/engine/src/flutter/impeller/renderer/snapshot.h
index 0d9a57471a..849b7ce04c 100644
--- a/engine/src/flutter/impeller/renderer/snapshot.h
+++ b/engine/src/flutter/impeller/renderer/snapshot.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_SNAPSHOT_H_
+#define FLUTTER_IMPELLER_RENDERER_SNAPSHOT_H_
 
 #include <functional>
 #include <memory>
@@ -47,3 +48,5 @@ struct Snapshot {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_SNAPSHOT_H_
diff --git a/engine/src/flutter/impeller/renderer/surface.h b/engine/src/flutter/impeller/renderer/surface.h
index 3ce7937f76..e0e4abe5fa 100644
--- a/engine/src/flutter/impeller/renderer/surface.h
+++ b/engine/src/flutter/impeller/renderer/surface.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_SURFACE_H_
+#define FLUTTER_IMPELLER_RENDERER_SURFACE_H_
 
 #include <functional>
 #include <memory>
@@ -42,3 +43,5 @@ class Surface {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_SURFACE_H_
diff --git a/engine/src/flutter/impeller/renderer/testing/mocks.h b/engine/src/flutter/impeller/renderer/testing/mocks.h
index 4af4bc1191..4960a57ef7 100644
--- a/engine/src/flutter/impeller/renderer/testing/mocks.h
+++ b/engine/src/flutter/impeller/renderer/testing/mocks.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_TESTING_MOCKS_H_
+#define FLUTTER_IMPELLER_RENDERER_TESTING_MOCKS_H_
 
 #include "gmock/gmock.h"
 #include "impeller/core/allocator.h"
@@ -215,3 +216,5 @@ class MockSampler : public Sampler {
 
 }  // namespace testing
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_TESTING_MOCKS_H_
diff --git a/engine/src/flutter/impeller/renderer/vertex_buffer_builder.h b/engine/src/flutter/impeller/renderer/vertex_buffer_builder.h
index 2f92e24c96..78a780bae1 100644
--- a/engine/src/flutter/impeller/renderer/vertex_buffer_builder.h
+++ b/engine/src/flutter/impeller/renderer/vertex_buffer_builder.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_VERTEX_BUFFER_BUILDER_H_
+#define FLUTTER_IMPELLER_RENDERER_VERTEX_BUFFER_BUILDER_H_
 
 #include <initializer_list>
 #include <map>
@@ -160,3 +161,5 @@ class VertexBufferBuilder {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_VERTEX_BUFFER_BUILDER_H_
diff --git a/engine/src/flutter/impeller/renderer/vertex_descriptor.h b/engine/src/flutter/impeller/renderer/vertex_descriptor.h
index 72d12e11df..5d1143f0ff 100644
--- a/engine/src/flutter/impeller/renderer/vertex_descriptor.h
+++ b/engine/src/flutter/impeller/renderer/vertex_descriptor.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RENDERER_VERTEX_DESCRIPTOR_H_
+#define FLUTTER_IMPELLER_RENDERER_VERTEX_DESCRIPTOR_H_
 
 #include <vector>
 
@@ -75,3 +76,5 @@ class VertexDescriptor final : public Comparable<VertexDescriptor> {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RENDERER_VERTEX_DESCRIPTOR_H_
diff --git a/engine/src/flutter/impeller/runtime_stage/runtime_stage.h b/engine/src/flutter/impeller/runtime_stage/runtime_stage.h
index 8ee501bbdb..8b52bdcd50 100644
--- a/engine/src/flutter/impeller/runtime_stage/runtime_stage.h
+++ b/engine/src/flutter/impeller/runtime_stage/runtime_stage.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RUNTIME_STAGE_RUNTIME_STAGE_H_
+#define FLUTTER_IMPELLER_RUNTIME_STAGE_RUNTIME_STAGE_H_
 
 #include <memory>
 #include <string>
@@ -56,3 +57,5 @@ class RuntimeStage {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RUNTIME_STAGE_RUNTIME_STAGE_H_
diff --git a/engine/src/flutter/impeller/runtime_stage/runtime_stage_playground.h b/engine/src/flutter/impeller/runtime_stage/runtime_stage_playground.h
index f1b3502594..86f9cc4bc4 100644
--- a/engine/src/flutter/impeller/runtime_stage/runtime_stage_playground.h
+++ b/engine/src/flutter/impeller/runtime_stage/runtime_stage_playground.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_RUNTIME_STAGE_RUNTIME_STAGE_PLAYGROUND_H_
+#define FLUTTER_IMPELLER_RUNTIME_STAGE_RUNTIME_STAGE_PLAYGROUND_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/playground/playground_test.h"
@@ -25,3 +26,5 @@ class RuntimeStagePlayground : public PlaygroundTest {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_RUNTIME_STAGE_RUNTIME_STAGE_PLAYGROUND_H_
diff --git a/engine/src/flutter/impeller/scene/animation/animation.h b/engine/src/flutter/impeller/scene/animation/animation.h
index 37735412e8..09ebfac3f8 100644
--- a/engine/src/flutter/impeller/scene/animation/animation.h
+++ b/engine/src/flutter/impeller/scene/animation/animation.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_ANIMATION_ANIMATION_H_
+#define FLUTTER_IMPELLER_SCENE_ANIMATION_ANIMATION_H_
 
 #include <memory>
 #include <string>
@@ -77,3 +78,5 @@ class Animation final {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_ANIMATION_ANIMATION_H_
diff --git a/engine/src/flutter/impeller/scene/animation/animation_clip.h b/engine/src/flutter/impeller/scene/animation/animation_clip.h
index 773284b047..35c3339ae8 100644
--- a/engine/src/flutter/impeller/scene/animation/animation_clip.h
+++ b/engine/src/flutter/impeller/scene/animation/animation_clip.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_ANIMATION_ANIMATION_CLIP_H_
+#define FLUTTER_IMPELLER_SCENE_ANIMATION_ANIMATION_CLIP_H_
 
 #include <memory>
 #include <unordered_map>
@@ -92,3 +93,5 @@ class AnimationClip final {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_ANIMATION_ANIMATION_CLIP_H_
diff --git a/engine/src/flutter/impeller/scene/animation/animation_player.h b/engine/src/flutter/impeller/scene/animation/animation_player.h
index ebc77c3f2e..44878e1c38 100644
--- a/engine/src/flutter/impeller/scene/animation/animation_player.h
+++ b/engine/src/flutter/impeller/scene/animation/animation_player.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_ANIMATION_ANIMATION_PLAYER_H_
+#define FLUTTER_IMPELLER_SCENE_ANIMATION_ANIMATION_PLAYER_H_
 
 #include <map>
 #include <memory>
@@ -52,3 +53,5 @@ class AnimationPlayer final {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_ANIMATION_ANIMATION_PLAYER_H_
diff --git a/engine/src/flutter/impeller/scene/animation/animation_transforms.h b/engine/src/flutter/impeller/scene/animation/animation_transforms.h
index b15c981778..59adb64938 100644
--- a/engine/src/flutter/impeller/scene/animation/animation_transforms.h
+++ b/engine/src/flutter/impeller/scene/animation/animation_transforms.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_ANIMATION_ANIMATION_TRANSFORMS_H_
+#define FLUTTER_IMPELLER_SCENE_ANIMATION_ANIMATION_TRANSFORMS_H_
 
 #include "impeller/geometry/matrix_decomposition.h"
 
@@ -16,3 +17,5 @@ struct AnimationTransforms {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_ANIMATION_ANIMATION_TRANSFORMS_H_
diff --git a/engine/src/flutter/impeller/scene/animation/property_resolver.h b/engine/src/flutter/impeller/scene/animation/property_resolver.h
index 10df83e433..722318d32d 100644
--- a/engine/src/flutter/impeller/scene/animation/property_resolver.h
+++ b/engine/src/flutter/impeller/scene/animation/property_resolver.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_ANIMATION_PROPERTY_RESOLVER_H_
+#define FLUTTER_IMPELLER_SCENE_ANIMATION_PROPERTY_RESOLVER_H_
 
 #include <memory>
 #include <string>
@@ -139,3 +140,5 @@ class ScaleTimelineResolver final : public TimelineResolver {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_ANIMATION_PROPERTY_RESOLVER_H_
diff --git a/engine/src/flutter/impeller/scene/camera.h b/engine/src/flutter/impeller/scene/camera.h
index 0b31e4f89a..3f833320da 100644
--- a/engine/src/flutter/impeller/scene/camera.h
+++ b/engine/src/flutter/impeller/scene/camera.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_CAMERA_H_
+#define FLUTTER_IMPELLER_SCENE_CAMERA_H_
 
 #include <optional>
 
@@ -32,3 +33,5 @@ class Camera {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_CAMERA_H_
diff --git a/engine/src/flutter/impeller/scene/geometry.h b/engine/src/flutter/impeller/scene/geometry.h
index 0a4b9c040f..de8f975633 100644
--- a/engine/src/flutter/impeller/scene/geometry.h
+++ b/engine/src/flutter/impeller/scene/geometry.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_GEOMETRY_H_
+#define FLUTTER_IMPELLER_SCENE_GEOMETRY_H_
 
 #include <memory>
 
@@ -141,3 +142,5 @@ class SkinnedVertexBufferGeometry final : public Geometry {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_GEOMETRY_H_
diff --git a/engine/src/flutter/impeller/scene/importer/conversions.h b/engine/src/flutter/impeller/scene/importer/conversions.h
index cb11d3c42f..6c91164426 100644
--- a/engine/src/flutter/impeller/scene/importer/conversions.h
+++ b/engine/src/flutter/impeller/scene/importer/conversions.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_IMPORTER_CONVERSIONS_H_
+#define FLUTTER_IMPELLER_SCENE_IMPORTER_CONVERSIONS_H_
 
 #include <cstddef>
 #include <map>
@@ -52,3 +53,5 @@ std::unique_ptr<fb::Color> ToFBColor(const std::vector<double>& c);
 }  // namespace importer
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_IMPORTER_CONVERSIONS_H_
diff --git a/engine/src/flutter/impeller/scene/importer/importer.h b/engine/src/flutter/impeller/scene/importer/importer.h
index 6766adbce1..af0934522e 100644
--- a/engine/src/flutter/impeller/scene/importer/importer.h
+++ b/engine/src/flutter/impeller/scene/importer/importer.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_IMPORTER_IMPORTER_H_
+#define FLUTTER_IMPELLER_SCENE_IMPORTER_IMPORTER_H_
 
 #include <array>
 #include <memory>
@@ -19,3 +20,5 @@ bool ParseGLTF(const fml::Mapping& source_mapping, fb::SceneT& out_scene);
 }
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_IMPORTER_IMPORTER_H_
diff --git a/engine/src/flutter/impeller/scene/importer/switches.h b/engine/src/flutter/impeller/scene/importer/switches.h
index d9b298216c..3b5294442a 100644
--- a/engine/src/flutter/impeller/scene/importer/switches.h
+++ b/engine/src/flutter/impeller/scene/importer/switches.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_IMPORTER_SWITCHES_H_
+#define FLUTTER_IMPELLER_SCENE_IMPORTER_SWITCHES_H_
 
 #include <iostream>
 #include <memory>
@@ -36,3 +37,5 @@ struct Switches {
 }  // namespace importer
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_IMPORTER_SWITCHES_H_
diff --git a/engine/src/flutter/impeller/scene/importer/types.h b/engine/src/flutter/impeller/scene/importer/types.h
index 308527fe33..0312618e5a 100644
--- a/engine/src/flutter/impeller/scene/importer/types.h
+++ b/engine/src/flutter/impeller/scene/importer/types.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_IMPORTER_TYPES_H_
+#define FLUTTER_IMPELLER_SCENE_IMPORTER_TYPES_H_
 
 namespace impeller {
 namespace scene {
@@ -16,3 +17,5 @@ enum class SourceType {
 }  // namespace importer
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_IMPORTER_TYPES_H_
diff --git a/engine/src/flutter/impeller/scene/importer/vertices_builder.h b/engine/src/flutter/impeller/scene/importer/vertices_builder.h
index 6022573ab7..4244a2563d 100644
--- a/engine/src/flutter/impeller/scene/importer/vertices_builder.h
+++ b/engine/src/flutter/impeller/scene/importer/vertices_builder.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_IMPORTER_VERTICES_BUILDER_H_
+#define FLUTTER_IMPELLER_SCENE_IMPORTER_VERTICES_BUILDER_H_
 
 #include <cstddef>
 #include <map>
@@ -169,3 +170,5 @@ class SkinnedVerticesBuilder final : public VerticesBuilder {
 }  // namespace importer
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_IMPORTER_VERTICES_BUILDER_H_
diff --git a/engine/src/flutter/impeller/scene/material.h b/engine/src/flutter/impeller/scene/material.h
index e3132cfb1c..c8954d540a 100644
--- a/engine/src/flutter/impeller/scene/material.h
+++ b/engine/src/flutter/impeller/scene/material.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_MATERIAL_H_
+#define FLUTTER_IMPELLER_SCENE_MATERIAL_H_
 
 #include <memory>
 
@@ -137,3 +138,5 @@ class PhysicallyBasedMaterial final : public Material {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_MATERIAL_H_
diff --git a/engine/src/flutter/impeller/scene/mesh.h b/engine/src/flutter/impeller/scene/mesh.h
index e72a598f83..008938324c 100644
--- a/engine/src/flutter/impeller/scene/mesh.h
+++ b/engine/src/flutter/impeller/scene/mesh.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_MESH_H_
+#define FLUTTER_IMPELLER_SCENE_MESH_H_
 
 #include <memory>
 #include <type_traits>
@@ -47,3 +48,5 @@ class Mesh final {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_MESH_H_
diff --git a/engine/src/flutter/impeller/scene/node.h b/engine/src/flutter/impeller/scene/node.h
index b08684af5b..0e2649aef2 100644
--- a/engine/src/flutter/impeller/scene/node.h
+++ b/engine/src/flutter/impeller/scene/node.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_NODE_H_
+#define FLUTTER_IMPELLER_SCENE_NODE_H_
 
 #include <memory>
 #include <mutex>
@@ -137,3 +138,5 @@ class Node final {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_NODE_H_
diff --git a/engine/src/flutter/impeller/scene/pipeline_key.h b/engine/src/flutter/impeller/scene/pipeline_key.h
index d059a48e47..56f41f3658 100644
--- a/engine/src/flutter/impeller/scene/pipeline_key.h
+++ b/engine/src/flutter/impeller/scene/pipeline_key.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_PIPELINE_KEY_H_
+#define FLUTTER_IMPELLER_SCENE_PIPELINE_KEY_H_
 
 #include "flutter/fml/hash_combine.h"
 
@@ -40,3 +41,5 @@ struct PipelineKey {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_PIPELINE_KEY_H_
diff --git a/engine/src/flutter/impeller/scene/scene.h b/engine/src/flutter/impeller/scene/scene.h
index b5d3b09ecf..4cd5c0895e 100644
--- a/engine/src/flutter/impeller/scene/scene.h
+++ b/engine/src/flutter/impeller/scene/scene.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_SCENE_H_
+#define FLUTTER_IMPELLER_SCENE_SCENE_H_
 
 #include <memory>
 #include <vector>
@@ -43,3 +44,5 @@ class Scene {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_SCENE_H_
diff --git a/engine/src/flutter/impeller/scene/scene_context.h b/engine/src/flutter/impeller/scene/scene_context.h
index f85663b426..24d49249f7 100644
--- a/engine/src/flutter/impeller/scene/scene_context.h
+++ b/engine/src/flutter/impeller/scene/scene_context.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_SCENE_CONTEXT_H_
+#define FLUTTER_IMPELLER_SCENE_SCENE_CONTEXT_H_
 
 #include <memory>
 
@@ -151,3 +152,5 @@ class SceneContext {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_SCENE_CONTEXT_H_
diff --git a/engine/src/flutter/impeller/scene/scene_encoder.h b/engine/src/flutter/impeller/scene/scene_encoder.h
index 2cf096ec1a..a3690c52c7 100644
--- a/engine/src/flutter/impeller/scene/scene_encoder.h
+++ b/engine/src/flutter/impeller/scene/scene_encoder.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_SCENE_ENCODER_H_
+#define FLUTTER_IMPELLER_SCENE_SCENE_ENCODER_H_
 
 #include <memory>
 #include <string>
@@ -49,3 +50,5 @@ class SceneEncoder {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_SCENE_ENCODER_H_
diff --git a/engine/src/flutter/impeller/scene/skin.h b/engine/src/flutter/impeller/scene/skin.h
index 5693e6406d..77e663c964 100644
--- a/engine/src/flutter/impeller/scene/skin.h
+++ b/engine/src/flutter/impeller/scene/skin.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SCENE_SKIN_H_
+#define FLUTTER_IMPELLER_SCENE_SKIN_H_
 
 #include <memory>
 #include <optional>
@@ -42,3 +43,5 @@ class Skin final {
 
 }  // namespace scene
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SCENE_SKIN_H_
diff --git a/engine/src/flutter/impeller/shader_archive/multi_arch_shader_archive.h b/engine/src/flutter/impeller/shader_archive/multi_arch_shader_archive.h
index abcc7a9e2f..1a73380b7a 100644
--- a/engine/src/flutter/impeller/shader_archive/multi_arch_shader_archive.h
+++ b/engine/src/flutter/impeller/shader_archive/multi_arch_shader_archive.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SHADER_ARCHIVE_MULTI_ARCH_SHADER_ARCHIVE_H_
+#define FLUTTER_IMPELLER_SHADER_ARCHIVE_MULTI_ARCH_SHADER_ARCHIVE_H_
 
 #include <map>
 #include <memory>
@@ -44,3 +45,5 @@ class MultiArchShaderArchive {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SHADER_ARCHIVE_MULTI_ARCH_SHADER_ARCHIVE_H_
diff --git a/engine/src/flutter/impeller/shader_archive/multi_arch_shader_archive_writer.h b/engine/src/flutter/impeller/shader_archive/multi_arch_shader_archive_writer.h
index 163f9c3c5c..f04df91f36 100644
--- a/engine/src/flutter/impeller/shader_archive/multi_arch_shader_archive_writer.h
+++ b/engine/src/flutter/impeller/shader_archive/multi_arch_shader_archive_writer.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SHADER_ARCHIVE_MULTI_ARCH_SHADER_ARCHIVE_WRITER_H_
+#define FLUTTER_IMPELLER_SHADER_ARCHIVE_MULTI_ARCH_SHADER_ARCHIVE_WRITER_H_
 
 #include <map>
 
@@ -35,3 +36,5 @@ class MultiArchShaderArchiveWriter {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SHADER_ARCHIVE_MULTI_ARCH_SHADER_ARCHIVE_WRITER_H_
diff --git a/engine/src/flutter/impeller/shader_archive/shader_archive.h b/engine/src/flutter/impeller/shader_archive/shader_archive.h
index 8ee325d9c5..a13736d11e 100644
--- a/engine/src/flutter/impeller/shader_archive/shader_archive.h
+++ b/engine/src/flutter/impeller/shader_archive/shader_archive.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SHADER_ARCHIVE_SHADER_ARCHIVE_H_
+#define FLUTTER_IMPELLER_SHADER_ARCHIVE_SHADER_ARCHIVE_H_
 
 #include <memory>
 #include <type_traits>
@@ -75,3 +76,5 @@ class ShaderArchive {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SHADER_ARCHIVE_SHADER_ARCHIVE_H_
diff --git a/engine/src/flutter/impeller/shader_archive/shader_archive_types.h b/engine/src/flutter/impeller/shader_archive/shader_archive_types.h
index a8007f3b2f..2e2b6aae63 100644
--- a/engine/src/flutter/impeller/shader_archive/shader_archive_types.h
+++ b/engine/src/flutter/impeller/shader_archive/shader_archive_types.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SHADER_ARCHIVE_SHADER_ARCHIVE_TYPES_H_
+#define FLUTTER_IMPELLER_SHADER_ARCHIVE_SHADER_ARCHIVE_TYPES_H_
 
 namespace impeller {
 
@@ -19,3 +20,5 @@ enum class ArchiveRenderingBackend {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SHADER_ARCHIVE_SHADER_ARCHIVE_TYPES_H_
diff --git a/engine/src/flutter/impeller/shader_archive/shader_archive_writer.h b/engine/src/flutter/impeller/shader_archive/shader_archive_writer.h
index 7503e48f22..85f60432bb 100644
--- a/engine/src/flutter/impeller/shader_archive/shader_archive_writer.h
+++ b/engine/src/flutter/impeller/shader_archive/shader_archive_writer.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_SHADER_ARCHIVE_SHADER_ARCHIVE_WRITER_H_
+#define FLUTTER_IMPELLER_SHADER_ARCHIVE_SHADER_ARCHIVE_WRITER_H_
 
 #include <memory>
 #include <string>
@@ -43,3 +44,5 @@ class ShaderArchiveWriter {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_SHADER_ARCHIVE_SHADER_ARCHIVE_WRITER_H_
diff --git a/engine/src/flutter/impeller/tessellator/c/tessellator.h b/engine/src/flutter/impeller/tessellator/c/tessellator.h
index f79872f931..ef5bfc950f 100644
--- a/engine/src/flutter/impeller/tessellator/c/tessellator.h
+++ b/engine/src/flutter/impeller/tessellator/c/tessellator.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TESSELLATOR_C_TESSELLATOR_H_
+#define FLUTTER_IMPELLER_TESSELLATOR_C_TESSELLATOR_H_
 
 #include <cstdint>
 
@@ -50,3 +51,5 @@ IMPELLER_API void DestroyVertices(Vertices* vertices);
 
 }  // namespace impeller
 }
+
+#endif  // FLUTTER_IMPELLER_TESSELLATOR_C_TESSELLATOR_H_
diff --git a/engine/src/flutter/impeller/tessellator/tessellator.h b/engine/src/flutter/impeller/tessellator/tessellator.h
index b283c6c9cb..0ce56207fa 100644
--- a/engine/src/flutter/impeller/tessellator/tessellator.h
+++ b/engine/src/flutter/impeller/tessellator/tessellator.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TESSELLATOR_TESSELLATOR_H_
+#define FLUTTER_IMPELLER_TESSELLATOR_TESSELLATOR_H_
 
 #include <functional>
 #include <memory>
@@ -333,3 +334,5 @@ class Tessellator {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TESSELLATOR_TESSELLATOR_H_
diff --git a/engine/src/flutter/impeller/toolkit/egl/config.h b/engine/src/flutter/impeller/toolkit/egl/config.h
index 153aa6aa20..45ae789e9e 100644
--- a/engine/src/flutter/impeller/toolkit/egl/config.h
+++ b/engine/src/flutter/impeller/toolkit/egl/config.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TOOLKIT_EGL_CONFIG_H_
+#define FLUTTER_IMPELLER_TOOLKIT_EGL_CONFIG_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/toolkit/egl/egl.h"
@@ -74,3 +75,5 @@ class Config {
 
 }  // namespace egl
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TOOLKIT_EGL_CONFIG_H_
diff --git a/engine/src/flutter/impeller/toolkit/egl/context.h b/engine/src/flutter/impeller/toolkit/egl/context.h
index df33b3cf04..418ec24f92 100644
--- a/engine/src/flutter/impeller/toolkit/egl/context.h
+++ b/engine/src/flutter/impeller/toolkit/egl/context.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TOOLKIT_EGL_CONTEXT_H_
+#define FLUTTER_IMPELLER_TOOLKIT_EGL_CONTEXT_H_
 
 #include <functional>
 
@@ -56,3 +57,5 @@ class Context {
 
 }  // namespace egl
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TOOLKIT_EGL_CONTEXT_H_
diff --git a/engine/src/flutter/impeller/toolkit/egl/display.h b/engine/src/flutter/impeller/toolkit/egl/display.h
index 51ff9400dd..3e9b6236c6 100644
--- a/engine/src/flutter/impeller/toolkit/egl/display.h
+++ b/engine/src/flutter/impeller/toolkit/egl/display.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TOOLKIT_EGL_DISPLAY_H_
+#define FLUTTER_IMPELLER_TOOLKIT_EGL_DISPLAY_H_
 
 #include <memory>
 #include <optional>
@@ -47,3 +48,5 @@ class Display {
 
 }  // namespace egl
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TOOLKIT_EGL_DISPLAY_H_
diff --git a/engine/src/flutter/impeller/toolkit/egl/egl.h b/engine/src/flutter/impeller/toolkit/egl/egl.h
index af1bcca52f..fc22e1cdf0 100644
--- a/engine/src/flutter/impeller/toolkit/egl/egl.h
+++ b/engine/src/flutter/impeller/toolkit/egl/egl.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TOOLKIT_EGL_EGL_H_
+#define FLUTTER_IMPELLER_TOOLKIT_EGL_EGL_H_
 
 #include <EGL/egl.h>
 #define EGL_EGLEXT_PROTOTYPES
@@ -21,3 +22,5 @@ void LogEGLError(const char* file, int line);
 
 }  // namespace egl
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TOOLKIT_EGL_EGL_H_
diff --git a/engine/src/flutter/impeller/toolkit/egl/image.h b/engine/src/flutter/impeller/toolkit/egl/image.h
index 2fafe0f994..51e3330065 100644
--- a/engine/src/flutter/impeller/toolkit/egl/image.h
+++ b/engine/src/flutter/impeller/toolkit/egl/image.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TOOLKIT_EGL_IMAGE_H_
+#define FLUTTER_IMPELLER_TOOLKIT_EGL_IMAGE_H_
 
 #include "flutter/fml/unique_object.h"
 #include "flutter/impeller/toolkit/egl/egl.h"
@@ -72,3 +73,5 @@ using UniqueEGLImageKHR =
     fml::UniqueObject<EGLImageKHRWithDisplay, EGLImageKHRWithDisplayTraits>;
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TOOLKIT_EGL_IMAGE_H_
diff --git a/engine/src/flutter/impeller/toolkit/egl/surface.h b/engine/src/flutter/impeller/toolkit/egl/surface.h
index 605f6fb5ac..a8ca441660 100644
--- a/engine/src/flutter/impeller/toolkit/egl/surface.h
+++ b/engine/src/flutter/impeller/toolkit/egl/surface.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TOOLKIT_EGL_SURFACE_H_
+#define FLUTTER_IMPELLER_TOOLKIT_EGL_SURFACE_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/toolkit/egl/egl.h"
@@ -33,3 +34,5 @@ class Surface {
 
 }  // namespace egl
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TOOLKIT_EGL_SURFACE_H_
diff --git a/engine/src/flutter/impeller/toolkit/gles/gles.h b/engine/src/flutter/impeller/toolkit/gles/gles.h
index 599e3c9433..9cb1609fd5 100644
--- a/engine/src/flutter/impeller/toolkit/gles/gles.h
+++ b/engine/src/flutter/impeller/toolkit/gles/gles.h
@@ -2,8 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TOOLKIT_GLES_GLES_H_
+#define FLUTTER_IMPELLER_TOOLKIT_GLES_GLES_H_
 
 #include "GLES3/gl3.h"
 #define GL_GLEXT_PROTOTYPES
 #include "GLES2/gl2ext.h"
+
+#endif  // FLUTTER_IMPELLER_TOOLKIT_GLES_GLES_H_
diff --git a/engine/src/flutter/impeller/toolkit/gles/texture.h b/engine/src/flutter/impeller/toolkit/gles/texture.h
index b90007b414..cebef02e61 100644
--- a/engine/src/flutter/impeller/toolkit/gles/texture.h
+++ b/engine/src/flutter/impeller/toolkit/gles/texture.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TOOLKIT_GLES_TEXTURE_H_
+#define FLUTTER_IMPELLER_TOOLKIT_GLES_TEXTURE_H_
 
 #include "flutter/fml/unique_object.h"
 #include "flutter/impeller/toolkit/gles/gles.h"
@@ -37,3 +38,5 @@ struct GLTextureTraits {
 using UniqueGLTexture = fml::UniqueObject<GLTexture, GLTextureTraits>;
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TOOLKIT_GLES_TEXTURE_H_
diff --git a/engine/src/flutter/impeller/typographer/backends/skia/glyph_atlas_context_skia.h b/engine/src/flutter/impeller/typographer/backends/skia/glyph_atlas_context_skia.h
index ee4894f8c4..7f59eca618 100644
--- a/engine/src/flutter/impeller/typographer/backends/skia/glyph_atlas_context_skia.h
+++ b/engine/src/flutter/impeller/typographer/backends/skia/glyph_atlas_context_skia.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_GLYPH_ATLAS_CONTEXT_SKIA_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_GLYPH_ATLAS_CONTEXT_SKIA_H_
 
 #include "impeller/base/backend_cast.h"
 #include "impeller/typographer/glyph_atlas.h"
@@ -37,3 +38,5 @@ class GlyphAtlasContextSkia
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_GLYPH_ATLAS_CONTEXT_SKIA_H_
diff --git a/engine/src/flutter/impeller/typographer/backends/skia/text_frame_skia.h b/engine/src/flutter/impeller/typographer/backends/skia/text_frame_skia.h
index e7721a0c6e..fdb9d7693e 100644
--- a/engine/src/flutter/impeller/typographer/backends/skia/text_frame_skia.h
+++ b/engine/src/flutter/impeller/typographer/backends/skia/text_frame_skia.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_TEXT_FRAME_SKIA_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_TEXT_FRAME_SKIA_H_
 
 #include "impeller/typographer/text_frame.h"
 #include "third_party/skia/include/core/SkTextBlob.h"
@@ -13,3 +14,5 @@ std::shared_ptr<impeller::TextFrame> MakeTextFrameFromTextBlobSkia(
     const sk_sp<SkTextBlob>& blob);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_TEXT_FRAME_SKIA_H_
diff --git a/engine/src/flutter/impeller/typographer/backends/skia/typeface_skia.h b/engine/src/flutter/impeller/typographer/backends/skia/typeface_skia.h
index 20544b4e13..dc14c48f6a 100644
--- a/engine/src/flutter/impeller/typographer/backends/skia/typeface_skia.h
+++ b/engine/src/flutter/impeller/typographer/backends/skia/typeface_skia.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_TYPEFACE_SKIA_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_TYPEFACE_SKIA_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/base/backend_cast.h"
@@ -39,3 +40,5 @@ class TypefaceSkia final : public Typeface,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_TYPEFACE_SKIA_H_
diff --git a/engine/src/flutter/impeller/typographer/backends/skia/typographer_context_skia.h b/engine/src/flutter/impeller/typographer/backends/skia/typographer_context_skia.h
index 8db8082462..f3c8dd4560 100644
--- a/engine/src/flutter/impeller/typographer/backends/skia/typographer_context_skia.h
+++ b/engine/src/flutter/impeller/typographer/backends/skia/typographer_context_skia.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_TYPOGRAPHER_CONTEXT_SKIA_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_TYPOGRAPHER_CONTEXT_SKIA_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/typographer/typographer_context.h"
@@ -34,3 +35,5 @@ class TypographerContextSkia : public TypographerContext {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_TYPOGRAPHER_CONTEXT_SKIA_H_
diff --git a/engine/src/flutter/impeller/typographer/backends/stb/glyph_atlas_context_stb.h b/engine/src/flutter/impeller/typographer/backends/stb/glyph_atlas_context_stb.h
index c2c307e758..58962570d9 100644
--- a/engine/src/flutter/impeller/typographer/backends/stb/glyph_atlas_context_stb.h
+++ b/engine/src/flutter/impeller/typographer/backends/stb/glyph_atlas_context_stb.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_GLYPH_ATLAS_CONTEXT_STB_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_GLYPH_ATLAS_CONTEXT_STB_H_
 
 #include "impeller/base/backend_cast.h"
 #include "impeller/typographer/glyph_atlas.h"
@@ -59,3 +60,5 @@ class GlyphAtlasContextSTB
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_GLYPH_ATLAS_CONTEXT_STB_H_
diff --git a/engine/src/flutter/impeller/typographer/backends/stb/text_frame_stb.h b/engine/src/flutter/impeller/typographer/backends/stb/text_frame_stb.h
index 39f8cccc76..f37426f2d8 100644
--- a/engine/src/flutter/impeller/typographer/backends/stb/text_frame_stb.h
+++ b/engine/src/flutter/impeller/typographer/backends/stb/text_frame_stb.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_TEXT_FRAME_STB_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_TEXT_FRAME_STB_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/typographer/backends/stb/typeface_stb.h"
@@ -16,3 +17,5 @@ std::shared_ptr<TextFrame> MakeTextFrameSTB(
     const std::string& text);
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_TEXT_FRAME_STB_H_
diff --git a/engine/src/flutter/impeller/typographer/backends/stb/typeface_stb.h b/engine/src/flutter/impeller/typographer/backends/stb/typeface_stb.h
index 3600ade3de..c0f2c04083 100644
--- a/engine/src/flutter/impeller/typographer/backends/stb/typeface_stb.h
+++ b/engine/src/flutter/impeller/typographer/backends/stb/typeface_stb.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_TYPEFACE_STB_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_TYPEFACE_STB_H_
 
 #include "flutter/fml/macros.h"
 #include "flutter/fml/mapping.h"
@@ -46,3 +47,5 @@ class TypefaceSTB final : public Typeface,
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_TYPEFACE_STB_H_
diff --git a/engine/src/flutter/impeller/typographer/backends/stb/typographer_context_stb.h b/engine/src/flutter/impeller/typographer/backends/stb/typographer_context_stb.h
index 14975ae4fb..02e8132871 100644
--- a/engine/src/flutter/impeller/typographer/backends/stb/typographer_context_stb.h
+++ b/engine/src/flutter/impeller/typographer/backends/stb/typographer_context_stb.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_TYPOGRAPHER_CONTEXT_STB_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_TYPOGRAPHER_CONTEXT_STB_H_
 
 #include "impeller/typographer/typographer_context.h"
 
@@ -36,3 +37,5 @@ class TypographerContextSTB : public TypographerContext {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_TYPOGRAPHER_CONTEXT_STB_H_
diff --git a/engine/src/flutter/impeller/typographer/font.h b/engine/src/flutter/impeller/typographer/font.h
index bbfc569860..4f21748d5e 100644
--- a/engine/src/flutter/impeller/typographer/font.h
+++ b/engine/src/flutter/impeller/typographer/font.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_FONT_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_FONT_H_
 
 #include <memory>
 #include <optional>
@@ -77,3 +78,5 @@ struct std::hash<impeller::Font::Metrics> {
     return fml::HashCombine(m.point_size, m.skewX, m.scaleX);
   }
 };
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_FONT_H_
diff --git a/engine/src/flutter/impeller/typographer/font_glyph_pair.h b/engine/src/flutter/impeller/typographer/font_glyph_pair.h
index 00b59411d3..dd2d47e82b 100644
--- a/engine/src/flutter/impeller/typographer/font_glyph_pair.h
+++ b/engine/src/flutter/impeller/typographer/font_glyph_pair.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_FONT_GLYPH_PAIR_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_FONT_GLYPH_PAIR_H_
 
 #include <optional>
 #include <unordered_map>
@@ -54,3 +55,5 @@ struct std::equal_to<impeller::ScaledFont> {
     return lhs.font.IsEqual(rhs.font) && lhs.scale == rhs.scale;
   }
 };
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_FONT_GLYPH_PAIR_H_
diff --git a/engine/src/flutter/impeller/typographer/glyph.h b/engine/src/flutter/impeller/typographer/glyph.h
index c9aad01cba..7e2d688d2b 100644
--- a/engine/src/flutter/impeller/typographer/glyph.h
+++ b/engine/src/flutter/impeller/typographer/glyph.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_GLYPH_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_GLYPH_H_
 
 #include <cstdint>
 #include <functional>
@@ -69,3 +70,5 @@ struct std::less<impeller::Glyph> {
     return lhs.index < rhs.index;
   }
 };
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_GLYPH_H_
diff --git a/engine/src/flutter/impeller/typographer/glyph_atlas.h b/engine/src/flutter/impeller/typographer/glyph_atlas.h
index 94e4e8380a..ea4ea295e4 100644
--- a/engine/src/flutter/impeller/typographer/glyph_atlas.h
+++ b/engine/src/flutter/impeller/typographer/glyph_atlas.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_GLYPH_ATLAS_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_GLYPH_ATLAS_H_
 
 #include <functional>
 #include <memory>
@@ -204,3 +205,5 @@ class FontGlyphAtlas {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_GLYPH_ATLAS_H_
diff --git a/engine/src/flutter/impeller/typographer/lazy_glyph_atlas.h b/engine/src/flutter/impeller/typographer/lazy_glyph_atlas.h
index 3c14b2359b..a263ea188f 100644
--- a/engine/src/flutter/impeller/typographer/lazy_glyph_atlas.h
+++ b/engine/src/flutter/impeller/typographer/lazy_glyph_atlas.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_LAZY_GLYPH_ATLAS_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_LAZY_GLYPH_ATLAS_H_
 
 #include <unordered_map>
 
@@ -45,3 +46,5 @@ class LazyGlyphAtlas {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_LAZY_GLYPH_ATLAS_H_
diff --git a/engine/src/flutter/impeller/typographer/rectangle_packer.h b/engine/src/flutter/impeller/typographer/rectangle_packer.h
index 836849b42e..9213cae678 100644
--- a/engine/src/flutter/impeller/typographer/rectangle_packer.h
+++ b/engine/src/flutter/impeller/typographer/rectangle_packer.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_RECTANGLE_PACKER_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_RECTANGLE_PACKER_H_
 
 #include "flutter/fml/logging.h"
 
@@ -69,3 +70,5 @@ class RectanglePacker {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_RECTANGLE_PACKER_H_
diff --git a/engine/src/flutter/impeller/typographer/text_frame.h b/engine/src/flutter/impeller/typographer/text_frame.h
index d0d2d03e80..1089039cb2 100644
--- a/engine/src/flutter/impeller/typographer/text_frame.h
+++ b/engine/src/flutter/impeller/typographer/text_frame.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_TEXT_FRAME_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_TEXT_FRAME_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/typographer/glyph_atlas.h"
@@ -75,3 +76,5 @@ class TextFrame {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_TEXT_FRAME_H_
diff --git a/engine/src/flutter/impeller/typographer/text_run.h b/engine/src/flutter/impeller/typographer/text_run.h
index 340db94d9f..6bec4d1918 100644
--- a/engine/src/flutter/impeller/typographer/text_run.h
+++ b/engine/src/flutter/impeller/typographer/text_run.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_TEXT_RUN_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_TEXT_RUN_H_
 
 #include <vector>
 
@@ -77,3 +78,5 @@ class TextRun {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_TEXT_RUN_H_
diff --git a/engine/src/flutter/impeller/typographer/typeface.h b/engine/src/flutter/impeller/typographer/typeface.h
index 45722cbe7d..bf5123a46e 100644
--- a/engine/src/flutter/impeller/typographer/typeface.h
+++ b/engine/src/flutter/impeller/typographer/typeface.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_TYPEFACE_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_TYPEFACE_H_
 
 #include "flutter/fml/macros.h"
 #include "impeller/base/comparable.h"
@@ -31,3 +32,5 @@ class Typeface : public Comparable<Typeface> {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_TYPEFACE_H_
diff --git a/engine/src/flutter/impeller/typographer/typographer_context.h b/engine/src/flutter/impeller/typographer/typographer_context.h
index 696d093091..6e50027151 100644
--- a/engine/src/flutter/impeller/typographer/typographer_context.h
+++ b/engine/src/flutter/impeller/typographer/typographer_context.h
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#pragma once
+#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_TYPOGRAPHER_CONTEXT_H_
+#define FLUTTER_IMPELLER_TYPOGRAPHER_TYPOGRAPHER_CONTEXT_H_
 
 #include <memory>
 
@@ -53,3 +54,5 @@ class TypographerContext {
 };
 
 }  // namespace impeller
+
+#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_TYPOGRAPHER_CONTEXT_H_