Add a pixel test for CSS filter effects.

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 e95007fe858b2b243cd51a34e08546e17f6ac67e..6643bd4505929906daba3808a784f7ab5483ccaf 100644
--- a/content/test/gpu/page_sets/pixel_tests.py
+++ b/content/test/gpu/page_sets/pixel_tests.py
@@ -53,6 +53,14 @@ class WebGLNonChromiumImageSharedPageState(gpu_test_base.GpuSharedPageState):
       ['--disable-webgl-image-chromium'])
 
 
+class DisableMacOverlaysSharedPageState(gpu_test_base.GpuSharedPageState):
+  def __init__(self, test, finder_options, story_set):
+    super(DisableMacOverlaysSharedPageState, self).__init__(
+      test, finder_options, story_set)
+    finder_options.browser_options.AppendExtraBrowserArgs(
+      ['--disable-mac-overlays'])
+
+
 class PixelTestsStorySet(story_set_module.StorySet):
 
   """ Some basic test cases for GPU. """
@@ -125,6 +133,25 @@ class PixelTestsStorySet(story_set_module.StorySet):
         shared_page_state_class=WebGLNonChromiumImageSharedPageState,
         expectations=expectations))
 
+      # On macOS, test CSS filter effects with and without the CA compositor.
+      self.AddStory(PixelTestsPage(
+        url='file://../../data/gpu/filter_effects.html',
+        name=base_name + '.CSSFilterEffects',
+        test_rect=[0, 0, 300, 300],
+        revision=1,
+        story_set=self,
+        shared_page_state_class=gpu_test_base.GpuSharedPageState,
+        expectations=expectations))
+
+      self.AddStory(PixelTestsPage(
+        url='file://../../data/gpu/filter_effects.html',
+        name=base_name + '.CSSFilterEffects.NoOverlays',
+        test_rect=[0, 0, 300, 300],
+        revision=1,
+        story_set=self,
+        shared_page_state_class=DisableMacOverlaysSharedPageState,
+        expectations=expectations))
+
   def _AddAllPages(self, expectations, base_name, use_es3):
     if use_es3:
       es3_suffix = 'ES3'