[perf] Disable tab_switching.five_blank_pages on mac-reference

tools/perf/benchmarks/tab_switching.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 tab_switching
 import page_sets
 from telemetry import benchmark
 
@@ skipping 31 matching lines @@
 
   def CreateStorySet(self, options):
     return page_sets.Typical25PageSet(run_no_page_interactions=True)
 
   @classmethod
   def Name(cls):
     return 'tab_switching.typical_25'
 
 
 @benchmark.Disabled('android')  # http://crbug.com/460084
+@benchmark.Disabled('mac-reference')  # http://crbug.com/634360
 @benchmark.Enabled('has tabs')
 class TabSwitchingFiveBlankTabs(perf_benchmark.PerfBenchmark):
   """This test records the MPArch.RWH_TabSwitchPaintDuration histogram.
 
   The histogram is a measure of the time between when a tab was requested to be
   shown, and when first paint occurred. The script opens 5 blank pages in
   different tabs, waits for them to load, and then switches to each tab and
   records the metric. Blank pages are use to detect unnecessary idle wakeups.
   """
   test = tab_switching.TabSwitching
@@ skipping 34 matching lines @@
   shown, and when first paint occurred. The script opens each page in different
   tabs, waits for them to load, and then switches to each tab and records the
   metric. The pages were chosen by hand to stress the image decoding system.
   """
   test = tab_switching.TabSwitching
   page_set = page_sets.ToughImageCasesPageSet
 
   @classmethod
   def Name(cls):
     return 'tab_switching.tough_image_cases'