Revert of Disabled v8.top_25_smooth/smoothness.top_25_smooth on mac.

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 19 matching lines @@
   @classmethod
   def ValueCanBeAddedPredicate(cls, value, is_first_result):
     del is_first_result  # unused
     if (value.name == 'first_gesture_scroll_update_latency' and
         value.page.url in cls._PAGES_WITHOUT_SCROLL_GESTURE_BLACKLIST and
         value.values is None):
       return False
     return True
 
 
-@benchmark.Disabled('mac')  # crbug.com/623570
 class SmoothnessTop25(_Smoothness):
   """Measures rendering statistics while scrolling down the top 25 web pages.
 
   http://www.chromium.org/developers/design-documents/rendering-benchmarks
   """
   page_set = page_sets.Top25SmoothPageSet
 
   @classmethod
   def Name(cls):
     return 'smoothness.top_25_smooth'
@@ skipping 421 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