Implement OffscreenCanvas Unaccelerated 2d commit() on main thread

content/test/gpu/page_sets/pixel_tests.py

Index: content/test/gpu/page_sets/pixel_tests.py
diff --git a/content/test/gpu/page_sets/pixel_tests.py b/content/test/gpu/page_sets/pixel_tests.py
index deb75faa2dd907a1b66c2a59cf20d49402504dcb..08cc2b32e01d2cb738220b800af87af19d31004a 100644
--- a/content/test/gpu/page_sets/pixel_tests.py
+++ b/content/test/gpu/page_sets/pixel_tests.py
@@ -48,6 +48,15 @@ class IOSurface2DCanvasSharedPageState(gpu_test_base.GpuSharedPageState):
       ['--enable-accelerated-2d-canvas',
        '--disable-display-list-2d-canvas'])
 
+class SoftwareOffscreenCanvas2DSharedPageState(
+        gpu_test_base.GpuSharedPageState):
+  def __init__(self, test, finder_options, story_set):
+    super(SoftwareOffscreenCanvas2DSharedPageState, self).__init__(
+      test, finder_options, story_set)
+    finder_options.browser_options.AppendExtraBrowserArgs(
+      ['--disable-accelerated-2d-canvas',
+       '--disable-gpu-compositing',
+       '--enable-experimental-canvas-features'])
 
 class WebGLNonChromiumImageSharedPageState(gpu_test_base.GpuSharedPageState):
   def __init__(self, test, finder_options, story_set):
@@ -135,6 +144,16 @@ class PixelTestsStorySet(story_set_module.StorySet):
       shared_page_state_class=EnableExperimentalCanvasFeaturesSharedPageState,
       expectations=expectations))
 
+    # Pages requiring the use of --enable-experimental-canvas-features and
+    # --disable-accelerated-2d-canvas.
+    self.AddStory(PixelTestsPage(

[Ken Russell (switch to Gerrit), 2016/09/29 22:47:28]

This new page should now be added to
src/content/test/gpu/gpu_tests/pixel_test_pages.py instead, now that
https://codereview.chromium.org/2363343002/ has landed. Please let me know if
you have any questions about the new format. You no longer need to specify a
shared page state, just the browser command line arguments you want per-page.

+      url='file://../../data/gpu/pixel_acceleratedOffscreen2d_commit_main.html',
+      name=base_name + '.OffscreenCanvasUnaccelerated2D',
+      test_rect=[0, 0, 350, 350],
+      revision=1,
+      story_set=self,
+      shared_page_state_class=SoftwareOffscreenCanvas2DSharedPageState,
+      expectations=expectations))
 
     # Would be better to fetch this from Telemetry.
     # TODO(kbr): enable this on all platforms. Don't know what will