Roll src/third_party/skia f6206f91b3c1..f391d0f771c6 (4 commits) (flutter/engine#7220)

https://skia.googlesource.com/skia.git/+log/f6206f91b3c1..f391d0f771c6


Created with:
  gclient setdep -r src/third_party/skia@f391d0f771c6

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
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DEPS

@@ -23,7 +23,7 @@ vars = {
   'fuchsia_git': 'https://fuchsia.googlesource.com',
   'github_git': 'https://github.com',
   'skia_git': 'https://skia.googlesource.com',
-  'skia_revision': 'f6206f91b3c13de83865bfda464e147c5e39fd6e',
+  'skia_revision': 'f391d0f771c6b7f7c9ba13c24248a53babfdce0f',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 92e718d7f08ffefbf617736c0ced1c48
+Signature: 5b4273a3a37602c42b9d47c2476229fe
 
 UNUSED LICENSES:
 
@@ -1577,6 +1577,7 @@ FILE: ../../../third_party/skia/src/gpu/mtl/GrMtlCopyManager.h
 FILE: ../../../third_party/skia/src/gpu/mtl/GrMtlCopyManager.mm
 FILE: ../../../third_party/skia/src/gpu/mtl/GrMtlCopyPipelineState.h
 FILE: ../../../third_party/skia/src/gpu/mtl/GrMtlCopyPipelineState.mm
+FILE: ../../../third_party/skia/src/gpu/mtl/GrMtlCppUtil.h
 FILE: ../../../third_party/skia/src/gpu/mtl/GrMtlGpuCommandBuffer.h
 FILE: ../../../third_party/skia/src/gpu/mtl/GrMtlGpuCommandBuffer.mm
 FILE: ../../../third_party/skia/src/gpu/mtl/GrMtlPipelineState.h