Adding YUVA support for enabling Alpha Playback

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': {
     'cc_source_files': [
       'animation.cc',
       'animation.h',
       'animation_curve.cc',
@@ skipping 293 matching lines @@
       'video_layer.cc',
       'video_layer.h',
       'video_layer_impl.cc',
       'video_layer_impl.h',
       'vsync_time_source.cc',
       'vsync_time_source.h',
       'worker_pool.cc',
       'worker_pool.h',
       'yuv_video_draw_quad.cc',
       'yuv_video_draw_quad.h',
+      'yuva_video_draw_quad.cc',
+      'yuva_video_draw_quad.h',
     ],
     'conditions': [
       ['inside_chromium_build==1', {
         'webkit_src_dir': '<(DEPTH)/third_party/WebKit',
       }, {
         'webkit_src_dir': '<(DEPTH)/../../..',
       }],
     ],
   },
   'conditions': [
@@ skipping 26 matching lines @@
         'include_dirs': [
           # TODO(jamesr): Remove once https://webkit.org/b/105259 lands + rolls
           '<(webkit_src_dir)/Source/Platform/chromium'
         ]
       },
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }