Update pixel test expectation and add new worker tests

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 5e535da66f5737fe0afb8a164d21e68635c104c9..e3fa4dcb05bdf8b29f9a4afe07b3ee8578d2c955 100644
--- a/content/test/gpu/page_sets/pixel_tests.py
+++ b/content/test/gpu/page_sets/pixel_tests.py
@@ -184,6 +184,15 @@ class PixelTestsStorySet(story_set_module.StorySet):
       expectations=expectations))
 
     self.AddStory(PixelTestsPage(
+      url='file://../../data/gpu/pixel_offscreenCanvas_webgl_commit_worker.html',
+      name=base_name + '.OffscreenCanvasWebGLRedBoxWorker' + es3_suffix,
+      test_rect=[0, 0, 300, 300],
+      revision=1,
+      story_set=self,
+      shared_page_state_class=EnableExperimentalCanvasFeaturesSharedPageState,
+      expectations=expectations))
+
+    self.AddStory(PixelTestsPage(
       url='file://../../data/gpu/pixel_canvas2d.html',
       name=base_name + '.Canvas2DRedBox' + es3_suffix,
       test_rect=[0, 0, 300, 300],