Implement WebGL's commit with software compositing

content/test/gpu/gpu_tests/pixel_test_pages.py

 # Copyright 2016 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.
 
 class PixelTestPage(object):
   """A wrapper class mimicking the functionality of the PixelTestsStorySet
   from the old-style GPU tests.
   """
   def __init__(self, url, name, test_rect, revision,
                expected_colors=None, tolerance=2, browser_args=None):
@@ skipping 149 matching lines @@
       browser_args=browser_args),
 
     PixelTestPage(
       'pixel_offscreenCanvas_webgl_commit_worker.html',
       base_name + '_OffscreenCanvasWebGLRedBoxWorker',
       test_rect=[0, 0, 300, 300],
       revision=3,
       browser_args=browser_args),
 
     PixelTestPage(
+      'pixel_offscreenCanvas_webgl_commit_main.html',
+      base_name + '_OffscreenCanvasWebGLSoftwareCompositing',
+      test_rect=[0, 0, 300, 300],
+      revision=1,
+      browser_args=browser_args + ['--disable-gpu-compositing']),
+
+    PixelTestPage(
+      'pixel_offscreenCanvas_webgl_commit_worker.html',
+      base_name + '_OffscreenCanvasWebGLSoftwareCompositingWorker',
+      test_rect=[0, 0, 300, 300],
+      revision=1,
+      browser_args=browser_args + ['--disable-gpu-compositing']),
+
+    PixelTestPage(
       'pixel_offscreenCanvas_2d_commit_main.html',
       base_name + '_OffscreenCanvasAccelerated2D',
       test_rect=[0, 0, 350, 350],
       revision=1,
       browser_args=browser_args),
 
     PixelTestPage(
       'pixel_offscreenCanvas_2d_commit_worker.html',
       base_name + '_OffscreenCanvasAccelerated2DWorker',
       test_rect=[0, 0, 350, 350],
@@ skipping 87 matching lines @@
       test_rect=[0, 0, 300, 300],
       revision=2),
     PixelTestPage(
       'filter_effects.html',
       base_name + '_CSSFilterEffects_NoOverlays',
       test_rect=[0, 0, 300, 300],
       revision=2,
       tolerance=10,
       browser_args=['--disable-mac-overlays']),
   ]