perf: Re-enable smoothness.tough_ad_cases on Android

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.
 import multiprocessing
 
 from core import perf_benchmark
 
 from benchmarks import silk_flags
 from measurements import smoothness
 import page_sets
@@ skipping 429 matching lines @@
 
 
 class SmoothnessToughTextureUploadCases(_Smoothness):
   page_set = page_sets.ToughTextureUploadCasesPageSet
 
   @classmethod
   def Name(cls):
     return 'smoothness.tough_texture_upload_cases'
 
 
-# http://crbug.com/647413
-@benchmark.Disabled('android')
 class SmoothnessToughAdCases(_Smoothness):
   """Measures rendering statistics while displaying advertisements."""
   page_set = page_sets.SyntheticToughAdCasesPageSet
 
   @classmethod
   def Name(cls):
     return 'smoothness.tough_ad_cases'
 
   @classmethod
   def ShouldDisable(cls, possible_browser):
@@ skipping 26 matching lines @@
   """Measures rendering statistics while scrolling advertisements."""
   page_set = page_sets.SyntheticToughWebglAdCasesPageSet
 
   @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