Add support for converting cc::Region to and from protobuf.

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,
   },
   'targets': [
     {
@@ skipping 572 matching lines @@
       'type': '<(component)',
       'sources': [
         'proto/display_item.proto',
         'proto/layer.proto',
         'proto/layer_position_constraint.proto',
         'proto/point.proto',
         'proto/point3f.proto',
         'proto/pointf.proto',
         'proto/rect.proto',
         'proto/rectf.proto',
+        'proto/region.proto',
         'proto/scroll_offset.proto',
         'proto/size.proto',
         'proto/sizef.proto',
         'proto/skregion.proto',
         'proto/skrrect.proto',
         'proto/skxfermode.proto',
         'proto/transform.proto',
         'proto/vector2df.proto',
       ],
       'defines': [
@@ skipping 54 matching lines @@
         'surfaces/surface_resource_holder.cc',
         'surfaces/surface_resource_holder.h',
         'surfaces/surfaces_export.h',
       ],
       'includes': [
         '../build/android/increase_size_for_speed.gypi',
       ],
     },
   ],
 }