gpu: Add YCbCr 420v extension.

ui/gl/gl_tests.gyp

 # Copyright 2015 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 31 matching lines @@
           'sources': [
             'egl_api_unittest.cc',
             'test/egl_initialization_displays_unittest.cc',
           ],
         }],
         ['OS == "linux" and use_x11 == 1', {
           'sources': [
             'glx_api_unittest.cc',
           ],
         }],
+        ['OS == "mac"', {
+          'sources': [
+            'gl_image_io_surface_unittest.cc',
+          ],
+        }],
         ['OS == "win"', {
           'sources': [
             'wgl_api_unittest.cc',
           ],
         }],
       ],
     }
   ],
   'conditions': [
     ['OS == "android"', {
@@ skipping 51 matching lines @@
               'dependencies': [
                 '<(DEPTH)/tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }