Disable image_decoding benchmark on Nexus 7v2

tools/perf/benchmarks/image_decoding.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 measurements import image_decoding
 import page_sets
 
 
 class ImageDecodingToughImageCases(perf_benchmark.PerfBenchmark):
   test = image_decoding.ImageDecoding
   # TODO: Rename this page set to tough_image_cases.py
   page_set = page_sets.ImageDecodingMeasurementPageSet
 
   @classmethod
   def Name(cls):
     return 'image_decoding.image_decoding_measurement'
+
+  @classmethod
+  def ShouldDisable(cls, possible_browser):
+    # crbug.com/667501
+    return possible_browser.platform.GetDeviceTypeName() == 'Nexus 7'