[Perf] Disable smoothness.tough_scrolling_cases on reference build.

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 336 matching lines @@
   page_set = page_sets.PolymerPageSet
 
   def SetExtraBrowserOptions(self, options):
     silk_flags.CustomizeBrowserOptionsForGpuRasterization(options)
 
   @classmethod
   def Name(cls):
     return 'smoothness.gpu_rasterization.polymer'
 
 
+@benchmark.Disabled('reference')  # crbug.com/549429
 class SmoothnessToughScrollingCases(_Smoothness):
   page_set = page_sets.ToughScrollingCasesPageSet
 
   @classmethod
   def ValueCanBeAddedPredicate(cls, value, is_first_result):
     del is_first_result  # unused
     # Only keep 'mean_pixels_approximated' and 'mean_pixels_checkerboarded'
     # metrics. (crbug.com/529331)
     return value.name in ('mean_pixels_approximated',
                           'mean_pixels_checkerboarded')
@@ skipping 123 matching lines @@
 
 
 @benchmark.Disabled('reference')  # http://crbug.com/496684
 class SmoothnessToughWebGLAdCases(_Smoothness):
   """Measures rendering statistics while scrolling advertisements."""
   page_set = page_sets.ToughWebglAdCasesPageSet
 
   @classmethod
   def Name(cls):
     return 'smoothness.tough_webgl_ad_cases'