Implement BroadcastChannel

components/webmessaging.gypi

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+  'variables': {
+    'chromium_code': 1,
+    'mojom_files': [
+      'webmessaging/public/interfaces/broadcast_channel.mojom',
+    ],
+  },
+  'targets': [
+    {
+      # GN version: //components/webmessaging/webmessaging
+      'target_name': 'webmessaging',
+      'type': 'static_library',
+      'dependencies': [
+        'webmessaging_mojo_bindings',
+        '../base/base.gyp:base',
+        '../url/url.gyp:url_lib',
+      ],
+      'sources': [
+        'webmessaging/broadcast_channel_provider.cc',
+        'webmessaging/broadcast_channel_provider.h',
+      ],
+    },
+    {
+      'target_name': 'webmessaging_mojo_bindings',
+      'type': 'static_library',
+      'sources': [ '<@(mojom_files)' ],
+      'dependencies': [
+        '../url/url.gyp:url_mojom',
+      ],
+      'export_dependent_settings': [
+        '../url/url.gyp:url_mojom',
+      ],
+      'variables': {
+        'mojom_typemaps': [
+          '../url/mojo/gurl.typemap',
+          '../url/mojo/origin.typemap',
+        ],
+      },
+      'includes': [
+        '../mojo/mojom_bindings_generator.gypi',
+      ],
+    },
+    {
+      'target_name': 'webmessaging_mojo_bindings_for_blink',
+      'type': 'static_library',
+      'sources': [ '<@(mojom_files)' ],
+      'dependencies': [
+        '../url/url.gyp:url_mojom_for_blink',
+      ],
+      'export_dependent_settings': [
+        '../url/url.gyp:url_mojom_for_blink',
+      ],
+      'variables': {
+        'for_blink': 'true',
+        'mojom_typemaps': [
+          '../third_party/WebKit/Source/platform/mojo/KURL.typemap',
+          '../third_party/WebKit/Source/platform/mojo/SecurityOrigin.typemap',
+        ],
+      },
+      'includes': [
+        '../mojo/mojom_bindings_generator.gypi',
+      ],
+    },
+  ],
+}