Add signalSyncPoint to the WebGraphicsContext3D command buffer impls.

cc/cc.gyp

 # Copyright (c) 2012 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,
     'cc_source_files': [
       'animation/animation.cc',
       'animation/animation.h',
@@ skipping 273 matching lines @@
       'resources/resource_update.cc',
       'resources/resource_update.h',
       'resources/resource_update_controller.cc',
       'resources/resource_update_controller.h',
       'resources/resource_update_queue.cc',
       'resources/resource_update_queue.h',
       'resources/scoped_resource.cc',
       'resources/scoped_resource.h',
       'resources/skpicture_content_layer_updater.cc',
       'resources/skpicture_content_layer_updater.h',
+      'resources/sync_point_helper.cc',
+      'resources/sync_point_helper.h',
       'resources/texture_mailbox.cc',
       'resources/texture_mailbox.h',
       'resources/tile.cc',
       'resources/tile.h',
       'resources/tile_manager.cc',
       'resources/tile_manager.h',
       'resources/tile_priority.cc',
       'resources/tile_priority.h',
       'resources/transferable_resource.cc',
       'resources/transferable_resource.h',
@@ skipping 78 matching lines @@
         'CC_IMPLEMENTATION=1',
       ],
       'sources': [
         '<@(cc_source_files)',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }