Disable some tests on Nexus 5X reference again

tools/perf/benchmarks/power.py

 # Copyright 2014 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 power
 import page_sets
 from telemetry import benchmark
@@ skipping 16 matching lines @@
 @benchmark.Enabled('android')
 class PowerTypical10Mobile(perf_benchmark.PerfBenchmark):
   """Android typical 10 mobile power test."""
   test = power.Power
   page_set = page_sets.Typical10MobilePageSet
 
   def SetExtraBrowserOptions(self, options):
     options.full_performance_mode = False
 
   @classmethod
+  def ShouldDisable(cls, possible_browser):  # http://crbug.com/597656
+    return (possible_browser.browser_type == 'reference' and
+            possible_browser.platform.GetDeviceTypeName() == 'Nexus 5X')
+
+  @classmethod
   def Name(cls):
     return 'power.typical_10_mobile'
 
 
 @benchmark.Enabled('android')
 class PowerToughAdCases(perf_benchmark.PerfBenchmark):
   """Android power test with tough ad pages."""
   test = power.Power
   page_set = page_sets.ToughAdCasesPageSet
 
@@ skipping 113 matching lines @@
     return 'power.gpu_rasterization.top_25'
 
   def CreateStorySet(self, _):
     # Exclude techcrunch.com. It is not suitable for this benchmark because it
     # does not consistently become quiescent within 60 seconds.
     stories = self.page_set()
     found = next((x for x in stories if 'techcrunch.com' in x.url), None)
     if found:
       stories.RemoveStory(found)
     return stories