[System Health] Disable stories failing on Android

tools/perf/page_sets/system_health/background_stories.py

 # Copyright 2016 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 page_sets.system_health import platforms
 from page_sets.system_health import system_health_story
 from page_sets.system_health.loading_stories import LoadGmailMobileStory
 
+from telemetry import decorators
+
+
 _WAIT_FOR_VIDEO_SECONDS = 5
 
 class _BackgroundStory(system_health_story.SystemHealthStory):
   """Abstract base class for background stories
 
   As in _LoadingStory except it puts the browser into the
   background before measuring.
   """
   ABSTRACT_STORY = True
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
@@ skipping 13 matching lines @@
     action_runner.ScrollPageToElement(selector='g-fab')
     action_runner.TapElement(selector='g-fab')
 
 
 class BackgroundFacebookMobileStory(_BackgroundStory):
   NAME = 'background:social:facebook'
   URL = 'https://www.facebook.com/rihanna'
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
 
+@decorators.Disabled('android')  # crbug.com/664521
 class BackgroundNytimesMobileStory(_BackgroundStory):
   """The third top website in http://www.alexa.com/topsites/category/News"""
   NAME = 'background:news:nytimes'
   URL = 'http://www.nytimes.com/2016/10/04/us/politics/vice-presidential-debate.html?_r=0'
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
   def _DidLoadDocument(self, action_runner):
     # Dismiss the 'You have n free articles' message.
     action_runner.WaitForElement(selector='.growl-dismiss')
     action_runner.TapElement(selector='.growl-dismiss')
@@ skipping 18 matching lines @@
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
 
 class BackgroundGmailMobileStory(LoadGmailMobileStory):
   NAME = 'background:tools:gmail'
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
   def _Measure(self, action_runner):
     action_runner.tab.browser.Background()
     super(BackgroundGmailMobileStory, self)._Measure(action_runner)
-