Revert of Disable smoothness/v8.key_mobile_sites_smooth

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 103 matching lines @@
 @benchmark.Disabled('android',
                     'mac')     # crbug.com/567802
 class SmoothnessKeyDesktopMoveCases(_Smoothness):
   page_set = page_sets.KeyDesktopMoveCasesPageSet
 
   @classmethod
   def Name(cls):
     return 'smoothness.key_desktop_move_cases'
 
 
-@benchmark.Disabled('all') # crbug.com/610338
+@benchmark.Enabled('android')
 class SmoothnessKeyMobileSites(_Smoothness):
   """Measures rendering statistics while scrolling down the key mobile sites.
 
   http://www.chromium.org/developers/design-documents/rendering-benchmarks
   """
   page_set = page_sets.KeyMobileSitesSmoothPageSet
 
   @classmethod
   def Name(cls):
     return 'smoothness.key_mobile_sites_smooth'
@@ skipping 414 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