Add SkBitmap StructTraits for skia::mojo::Bitmap.

chrome/chrome_common.gypi

 # Copyright (c) 2013 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': {
     # File lists shared with GN build.
     'chrome_common_sources': [
       'common/all_messages.h',
       'common/attrition_experiments.h',
@@ skipping 631 matching lines @@
         'common/safe_browsing/csd.proto',
         'common/safe_browsing/download_file_types.proto',
       ],
       'variables': {
         'proto_in_dir': 'common/safe_browsing',
         'proto_out_dir': 'chrome/common/safe_browsing',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
     {
+      'target_name': 'common_mojo_bindings_mojom',
+      'type': 'none',
+      'variables': {
+        'mojom_files': [
+          'common/image_decoder.mojom',
+          'common/resource_usage_reporter.mojom',
+        ],
+        'mojom_typemaps': [
+          '../skia/public/interfaces/skbitmap.typemap',
+        ],
+      },
+      'dependencies': [
+        '../mojo/mojo_public.gyp:mojo_cpp_bindings',
+        '../skia/skia.gyp:skia_mojo',
+      ],
+      'includes': [ '../mojo/mojom_bindings_generator_explicit.gypi' ],
+    },
+    {
       # GN version: //chrome/common:mojo_bindings
       'target_name': 'common_mojo_bindings',
       'type': 'static_library',
-      'includes': [
-        '../mojo/mojom_bindings_generator.gypi'
+      'dependencies': [
+        'common_mojo_bindings_mojom',
+        '../mojo/mojo_public.gyp:mojo_cpp_bindings',
+        '../skia/skia.gyp:skia',
       ],
-      'sources': [
-        'common/image_decoder.mojom',
-        'common/resource_usage_reporter.mojom',
-      ],
-      'dependencies': [
-        '../mojo/mojo_public.gyp:mojo_cpp_bindings',
-        '../skia/skia.gyp:skia_mojo',
+      'export_dependent_settings': [
+        '../skia/skia.gyp:skia',
       ],
     },
   ],
   'conditions': [
     ['OS == "win"', {
       'targets': [
         {
           # GN version: //chrome/common:metrics_constants_util_win
           'target_name': 'metrics_constants_util_win',
           'type': 'static_library',
           'sources': [
             'common/metrics_constants_util_win.cc',
             'common/metrics_constants_util_win.h',
           ],
           'dependencies': [
             'installer_util',
             '../base/base.gyp:base',
           ],
         },
       ],
     }],
   ],
 }