text: # 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.page import page as page_module
  from telemetry import story
  
  
  class ToughLayerCasesPage(page_module.Page):
  
    def __init__(self, url, page_set):
      super(ToughLayerCasesPage, self).__init__(url=url, page_set=page_set)
  
  
  class ToughLayerCasesPageSet(story.StorySet):
  
    """ A collection of tests to measure layer performance. """
  
    def __init__(self):
      super(ToughLayerCasesPageSet, self).__init__()
  
      self.AddStory(ToughLayerCasesPage(
        'file://layer_stress_tests/opacity.html', self))
  