Add background stories to MobileSystemHealth

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
+
+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
+
+  def _Measure(self, action_runner):
+    action_runner.tab.browser.Background()
+    super(_BackgroundStory, self)._Measure(action_runner)
+
+
+class BackgroundGoogleStory(_BackgroundStory):
+  NAME = 'background:search:google'
+  URL = 'https://www.google.co.uk/'

[nednguyen, 2016/10/05 15:15:22]

Can you change this to https://www.google.co.uk/#q=tom+cruise+movies?

Bonus point if you add code to trigger the immersive movie browsing experience

[hjd, 2016/10/06 11:23:41]

Done :)

+
+
+class BackgroundFacebookMobileStory(_BackgroundStory):
+  NAME = 'background:social:facebook'
+  URL = 'https://www.facebook.com/rihanna'
+  SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
+
+
+class BackgroundNytimesMobileStory(_BackgroundStory):
+  """The third top website in http://www.alexa.com/topsites/category/News"""
+  NAME = 'background:news:nytimes'
+  URL = 'http://mobile.nytimes.com'

[nednguyen, 2016/10/05 15:15:23]

Can you use
http://www.nytimes.com/2016/10/04/us/politics/vice-presidential-debate.html?_r=0
?

[hjd, 2016/10/06 11:23:41]

Done.

+  SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
+
+
+class BackgroundImgurMobileStory(_BackgroundStory):
+  NAME = 'background:media:imgur'
+  URL = 'http://imgur.com/gallery/5UlBN'

[nednguyen, 2016/10/05 15:15:22]

How about using http://imgur.com/gallery/hUita ?

[hjd, 2016/10/06 11:23:41]

Done.

+  SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY