Determine mask UVs based on texture size

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,
                tolerance=2, browser_args=None, expected_colors=None):
@@ skipping 460 matching lines @@
       base_name + '_WebGLGreenTriangle_NonChromiumImage_NoAA_NoAlpha',
       test_rect=[0, 0, 300, 300],
       revision=1,
       browser_args=non_chromium_image_args),
 
     # On macOS, test CSS filter effects with and without the CA compositor.
     PixelTestPage(
       'filter_effects.html',
       base_name + '_CSSFilterEffects',
       test_rect=[0, 0, 300, 300],
-      revision=4),
+      revision=4,
+      tolerance=10),
     PixelTestPage(
       'filter_effects.html',
       base_name + '_CSSFilterEffects_NoOverlays',
       test_rect=[0, 0, 300, 300],
       revision=4,
       tolerance=10,
       browser_args=['--disable-mac-overlays']),
   ]
 
 def DirectCompositionPages(base_name):
   browser_args = ['--enable-direct-composition-layers']
   return [
     PixelTestPage(
       'pixel_video_mp4.html',
       base_name + '_DirectComposition_Video_MP4',
       test_rect=[0, 0, 300, 300],
       revision=1,
       browser_args=browser_args),
 
     PixelTestPage(
       'pixel_video_vp9.html',
       base_name + '_DirectComposition_Video_VP9',
       test_rect=[0, 0, 300, 300],
       revision=1,
       browser_args=browser_args),
   ]