Disabling smoothness.touch_pinch_zoom_cases on all platforms due to red bots

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 265 matching lines @@
 class SmoothnessSimpleMobilePages(_Smoothness):
   """Measures rendering statistics for simple mobile sites page set.
   """
   page_set = page_sets.SimpleMobileSitesPageSet
 
   @classmethod
   def Name(cls):
     return 'smoothness.simple_mobile_sites'
 
 
-@benchmark.Enabled('android')
+@benchmark.Disabled('all') # http://crbug.com/631015
 class SmoothnessToughPinchZoomCases(_Smoothness):
   """Measures rendering statistics for pinch-zooming in the tough pinch zoom
   cases.
   """
   page_set = page_sets.AndroidToughPinchZoomCasesPageSet
 
   @classmethod
   def Name(cls):
     return 'smoothness.tough_pinch_zoom_cases'
 
@@ skipping 184 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