Implement WebGL's commit on the main thread

content/test/gpu/page_sets/pixel_tests.py

 # Copyright 2014 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.
 
 from telemetry.story import story_set as story_set_module
 
 import sys
 
 from gpu_tests import gpu_test_base
 
@@ skipping 149 matching lines @@
 
   def _AddAllPages(self, expectations, base_name, use_es3):
     if use_es3:
       es3_suffix = 'ES3'
       shared_page_state_class = PixelTestsES3SharedPageState
     else:
       es3_suffix = ''
       shared_page_state_class = gpu_test_base.GpuSharedPageState
 
     self.AddStory(PixelTestsPage(
+      url='file://../../data/gpu/pixel_offscreenCanvas_webgl_commit_main.html',
+      name=base_name + '.OffscreenCanvasWebGLGreenBox' + es3_suffix,
+      test_rect=[0, 0, 300, 300],
+      revision=1,
+      story_set=self,
+      shared_page_state_class=shared_page_state_class,
+      expectations=expectations))
+
+    self.AddStory(PixelTestsPage(
       url='file://../../data/gpu/pixel_canvas2d.html',
       name=base_name + '.Canvas2DRedBox' + es3_suffix,
       test_rect=[0, 0, 300, 300],
       revision=7,
       story_set=self,
       shared_page_state_class=shared_page_state_class,
       expectations=expectations))
 
     self.AddStory(PixelTestsPage(
       url='file://../../data/gpu/pixel_css3d.html',
@@ skipping 67 matching lines @@
       story_set=self,
       shared_page_state_class=shared_page_state_class,
       expectations=expectations))
 
   @property
   def allow_mixed_story_states(self):
     # Return True here in order to be able to add the same tests with
     # a different SharedPageState on Mac which tests them with the
     # Core Profile rendering path.
     return True