Disable smoothness.gpu_rasterization.top_25_smooth on Nexus 6

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 121 matching lines @@
 @benchmark.Disabled('android-reference')  # crbug.com/588786
 @benchmark.Disabled('mac')  # crbug.com/563615
 class SmoothnessToughAnimationCases(_Smoothness):
   test = smoothness.SmoothnessWithRestart
   page_set = page_sets.ToughAnimationCasesPageSet
 
   @classmethod
   def Name(cls):
     return 'smoothness.tough_animation_cases'
 
+  @classmethod
+  def ShouldDisable(cls, possible_browser):
+    # crbug.com/596035
+    return possible_browser.platform.GetDeviceTypeName() == 'Nexus 6'
+
 
 @benchmark.Enabled('android')
 class SmoothnessKeySilkCases(_Smoothness):
   """Measures rendering statistics for the key silk cases without GPU
   rasterization.
   """
   page_set = page_sets.KeySilkCasesPageSet
 
   @classmethod
   def Name(cls):
@@ skipping 367 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