Setup GN rules to package embedder dylib as a Mac framework where supported. (flutter/engine#4270)

DEPS

@@ -114,7 +114,7 @@ allowed_hosts = [
 ]
 
 deps = {
-  'src': 'https://github.com/flutter/buildroot.git' + '@' + 'fcb277b9b2f78b5b59cda0a0b15edfc5f5578807',
+  'src': 'https://github.com/flutter/buildroot.git' + '@' + '77c6728e5ac9fc7d08b163ed5bf8bc64fc463f21',
 
    # Fuchsia compatibility
    #

engine/src/flutter/BUILD.gn

@@ -33,8 +33,10 @@ group("flutter") {
   # If on the host, compile all unittests targets.
   if (current_toolchain == host_toolchain) {
     if (is_mac) {
-      public_deps +=
-          [ "$flutter_root/shell/platform/darwin:flutter_channels_unittests" ]
+      public_deps += [
+        "$flutter_root/shell/platform/darwin:flutter_channels_unittests",
+        "$flutter_root/shell/platform/embedder:flutter_embedder_framework",
+      ]
     }
     if (!is_win) {
       public_deps += [ "$flutter_root/shell/platform/embedder:flutter_engine" ]
@@ -64,7 +66,9 @@ if (is_fuchsia) {
 
     package_name = "flutter"
 
-    deps = [ ":flutter" ]
+    deps = [
+      ":flutter",
+    ]
 
     binaries = [
       {

engine/src/flutter/shell/platform/embedder/BUILD.gn

@@ -12,20 +12,18 @@ source_set("embedder") {
   ]
 
   deps = [
-    "//third_party/dart/runtime:libdart_jit",
-    "//third_party/dart/runtime/bin:embedded_dart_io",
     "$flutter_root/common",
     "$flutter_root/fml",
     "$flutter_root/shell/common",
     "$flutter_root/shell/gpu",
     "//garnet/public/lib/fxl",
+    "//third_party/dart/runtime:libdart_jit",
+    "//third_party/dart/runtime/bin:embedded_dart_io",
     "//third_party/skia",
     "//topaz/lib/tonic",
   ]
 
-  public_configs = [
-    "$flutter_root:config",
-  ]
+  public_configs = [ "$flutter_root:config" ]
 }
 
 shared_library("flutter_engine") {
@@ -33,7 +31,122 @@ shared_library("flutter_engine") {
     ":embedder",
   ]
 
-  public_configs = [
-    "$flutter_root:config",
-  ]
+  public_configs = [ "$flutter_root:config" ]
+}
+
+if (is_mac) {
+  _flutter_embedder_framework_dir = "$root_out_dir/FlutterEmbedder.framework"
+
+  copy("copy_dylib") {
+    visibility = [ ":*" ]
+    sources = [
+      "$root_out_dir/libflutter_engine.dylib",
+    ]
+    outputs = [
+      "$_flutter_embedder_framework_dir/Versions/A/FlutterEmbedder",
+    ]
+    deps = [
+      ":flutter_engine",
+    ]
+  }
+
+  copy("copy_headers") {
+    visibility = [ ":*" ]
+    sources = [
+      "embedder.h",
+    ]
+    outputs = [
+      "$_flutter_embedder_framework_dir/Versions/A/Headers/FlutterEmbedder.h",
+    ]
+  }
+
+  copy("copy_icu") {
+    visibility = [ ":*" ]
+    sources = [
+      "//third_party/icu/common/icudtl.dat",
+    ]
+    outputs = [
+      "$_flutter_embedder_framework_dir/Versions/A/Resources/icudtl.dat",
+    ]
+  }
+
+  copy("copy_info_plist") {
+    visibility = [ ":*" ]
+    sources = [
+      "EmbedderInfo.plist",
+    ]
+    outputs = [
+      "$_flutter_embedder_framework_dir/Versions/A/Resources/Info.plist",
+    ]
+  }
+
+  copy("copy_module_map") {
+    visibility = [ ":*" ]
+    sources = [
+      "embedder.modulemap",
+    ]
+    outputs = [
+      "$_flutter_embedder_framework_dir/Versions/A/Modules/module.modulemap",
+    ]
+  }
+
+  action("install_dylib") {
+    visibility = [ ":*" ]
+    stamp_file = "$root_build_dir/flutter_embedder_install_name_stamp"
+    script = "$flutter_root/sky/tools/change_install_name.py"
+
+    inputs = [
+      "$_flutter_embedder_framework_dir/Versions/A/FlutterEmbedder",
+    ]
+
+    outputs = [
+      stamp_file,
+    ]
+
+    args = [
+      "--dylib",
+      "FlutterEmbedder.framework/Versions/A/FlutterEmbedder",
+      "--install_name",
+      "@rpath/FlutterEmbedder.framework/Versions/A/FlutterEmbedder",
+      "--stamp",
+      rebase_path(stamp_file),
+    ]
+
+    deps = [
+      ":copy_dylib",
+    ]
+  }
+
+  action("generate_symlinks") {
+    script = "//build/config/mac/package_framework.py"
+    outputs = [
+      "$root_build_dir/FlutterEmbedder.stamp",
+    ]
+    args = [
+      "--framework",
+      "FlutterEmbedder.framework",
+      "--version",
+      "A",
+      "--contents",
+      "FlutterEmbedder",
+      "Resources",
+      "Headers",
+      "Modules",
+      "--stamp",
+      "FlutterEmbedder.stamp",
+    ]
+    deps = [
+      ":copy_headers",
+      ":copy_icu",
+      ":copy_info_plist",
+      ":copy_module_map",
+      ":install_dylib",
+    ]
+  }
+
+  group("flutter_embedder_framework") {
+    deps = [
+      ":generate_symlinks",
+    ]
+  }
 }

engine/src/flutter/shell/platform/embedder/EmbedderInfo.plist

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>FlutterEmbedder</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter_embedder</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>FlutterEmbedder</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSupportedPlatforms</key>
+  <array>
+    <string>MacOSX</string>
+  </array>
+  <key>CFBundleVersion</key>
+  <string>1</string>
+  <key>NSHumanReadableCopyright</key>
+  <string>Copyright 2017 The Flutter Authors. All rights reserved.</string>
+</dict>
+</plist>

engine/src/flutter/shell/platform/embedder/embedder.modulemap

@@ -0,0 +1,6 @@
+framework module FlutterEmbedder {
+  umbrella header "FlutterEmbedder.h"
+
+  export *
+  module * { export * }
+}