Revert of Disable smoothness.gpu_rasterization.tough_path_rendering_cases for yosemite.

tools/perf/benchmarks/smoothness.py

 # Copyright 2013 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 core import perf_benchmark
 
 from benchmarks import silk_flags
 from measurements import smoothness
 import page_sets
 import page_sets.key_silk_cases
@@ skipping 169 matching lines @@
   page_set = page_sets.KeyMobileSitesSmoothPageSet
 
   def SetExtraBrowserOptions(self, options):
     silk_flags.CustomizeBrowserOptionsForGpuRasterization(options)
 
   @classmethod
   def Name(cls):
     return 'smoothness.gpu_rasterization.key_mobile_sites_smooth'
 
 
-@benchmark.Disabled('yosemite')  # crbug.com/581219
 class SmoothnessGpuRasterizationToughPathRenderingCases(_Smoothness):
   """Tests a selection of pages with SVG and 2D canvas paths with GPU
   rasterization.
   """
   tag = 'gpu_rasterization'
   page_set = page_sets.ToughPathRenderingCasesPageSet
 
   def SetExtraBrowserOptions(self, options):
     silk_flags.CustomizeBrowserOptionsForGpuRasterization(options)
 
@@ skipping 307 matching lines @@
   """Measures rendering statistics while scrolling advertisements."""
   page_set = page_sets.ToughWebglAdCasesPageSet
 
   @classmethod
   def Name(cls):
     return 'smoothness.tough_webgl_ad_cases'
 
   @classmethod
   def ShouldDisable(cls, possible_browser):
     return cls.IsSvelte(possible_browser)  # http://crbug.com/574485