Disable start_with_url.cold.startup_pages on Nexus 7v2 and Nexus 9

tools/perf/benchmarks/start_with_url.py

 # Copyright 2015 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
 import page_sets
 
 from telemetry import benchmark
 from telemetry.timeline import chrome_trace_category_filter
 from telemetry.web_perf import timeline_based_measurement
@@ skipping 26 matching lines @@
   """Measures time to start Chrome cold with startup URLs."""
 
   page_set = page_sets.StartupPagesPageSet
   options = {'pageset_repeat': 5}
 
   def SetExtraBrowserOptions(self, options):
     options.clear_sytem_cache_for_browser_and_profile_on_start = True
     super(StartWithUrlColdTBM, self).SetExtraBrowserOptions(options)
 
   @classmethod
+  def ShouldDisable(cls, possible_browser):  # http://crbug.com/667470
+    return (possible_browser.platform.GetDeviceTypeName() in
+            ['Nexus 7v2', 'Nexus 9'])
+
+  @classmethod
   def Name(cls):
     return 'start_with_url.cold.startup_pages'
 
 
 @benchmark.Enabled('has tabs')
 @benchmark.Enabled('android')
 @benchmark.Disabled('android-reference')  # crbug.com/588786
 @benchmark.Disabled('chromeos', 'linux', 'mac', 'win')
 class StartWithUrlWarmTBM(_StartupPerfBenchmark):
   """Measures stimetime to start Chrome warm with startup URLs."""
 
   page_set = page_sets.StartupPagesPageSet
   options = {'pageset_repeat': 11}
 
   @classmethod
   def Name(cls):
     return 'start_with_url.warm.startup_pages'
 
   @classmethod
   def ValueCanBeAddedPredicate(cls, value, is_first_result):
     del value  # unused
     # Ignores first results because the first invocation is actualy cold since
     # we are loading the profile for the first time.
     return not is_first_result