Add pixel test for solid color backgrounds.

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 181 matching lines @@
       name=base_name + '.ScissorTestWithPreserveDrawingBuffer' + es3_suffix,
       test_rect=[0, 0, 300, 300],
       revision=0, # This is not used.
       story_set=self,
       shared_page_state_class=shared_page_state_class,
       expectations=expectations,
       expected_colors='../../data/gpu/pixel_scissor_expectations.json'))
 
     self.AddStory(PixelTestsPage(
       url='file://../../data/gpu/pixel_canvas2d_webgl.html',
-      name=base_name + '.2DCanvasWebGL',
+      name=base_name + '.2DCanvasWebGL' + es3_suffix,
       test_rect=[0, 0, 300, 300],
       revision=2,
       story_set=self,
       shared_page_state_class=shared_page_state_class,
       expectations=expectations))
 
+    self.AddStory(PixelTestsPage(
+      url='file://../../data/gpu/pixel_background.html',
+      name=base_name + '.SolidColorBackground' + es3_suffix,
+      test_rect=[500, 500, 100, 100],
+      revision=1,
+      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