[system health] Add desktop browsing story for facebook and change url of twitter story.

tools/perf/page_sets/system_health/browsing_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 _BrowsingStory(system_health_story.SystemHealthStory):
   """Abstract base class for browsing stories.
@@ skipping 76 matching lines @@
   ITEMS_TO_VISIT = 2
   # TODO(ulan): Enable this story on mobile once it uses less memory and
   # does not crash with OOM.
   SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY
 
 
 class FacebookMobileStory(_NewsBrowsingStory):
   NAME = 'browse:social:facebook'
   URL = 'https://www.facebook.com/rihanna'
   ITEM_SELECTOR = 'article ._5msj'
-  # Facebook on desktop is not interesting because it embeds post comments
-  # directly in the main timeline.
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
 
+class FacebookDesktopStory(_NewsBrowsingStory):
+  NAME = 'browse:social:facebook'
+  URL = 'https://www.facebook.com/rihanna'
+  ITEM_SELECTOR = '._4-eo'
+  IS_SINGLE_PAGE_APP = True
+  # Web-page-replay does not work for this website:
+  # https://github.com/chromium/web-page-replay/issues/79.
+  SUPPORTED_PLATFORMS = platforms.NO_PLATFORMS
+
+
 class HackerNewsStory(_NewsBrowsingStory):
   NAME = 'browse:news:hackernews'
   URL = 'https://news.ycombinator.com'
   ITEM_SELECTOR = '.athing .title > a'
 
 
 class NytimesMobileStory(_NewsBrowsingStory):
   """The third top website in http://www.alexa.com/topsites/category/News"""
   NAME = 'browse:news:nytimes'
   URL = 'http://mobile.nytimes.com'
@@ skipping 33 matching lines @@
   """The top website in http://www.alexa.com/topsites/category/News"""
   NAME = 'browse:news:reddit'
   URL = 'https://www.reddit.com/r/news/top/?sort=top&t=week'
   IS_SINGLE_PAGE_APP = True
   ITEM_SELECTOR = '.PostHeader__post-title-line'
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
 
 class TwitterMobileStory(_NewsBrowsingStory):
   NAME = 'browse:social:twitter'
-  URL = 'https://www.twitter.com/justinbieber?skip_interstitial=true'
+  URL = 'https://www.twitter.com/nasa'
   ITEM_SELECTOR = '.Tweet-text'
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
 
 class TwitterDesktopStory(_NewsBrowsingStory):
   NAME = 'browse:social:twitter'
-  URL = 'https://www.twitter.com/justinbieber?skip_interstitial=true'
+  URL = 'https://www.twitter.com/nasa'
   IS_SINGLE_PAGE_APP = True
   ITEM_SELECTOR = '.tweet-text'
   SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY
 
 
 class WashingtonPostMobileStory(_NewsBrowsingStory):
   """Progressive website"""
   NAME = 'browse:news:washingtonpost'
   URL = 'https://www.washingtonpost.com/pwa'
   IS_SINGLE_PAGE_APP = True
   ITEM_SELECTOR = '.hed > a'
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
   def _DidLoadDocument(self, action_runner):
     # Close the popup window.
     action_runner.ClickElement(selector='.close')
     super(WashingtonPostMobileStory, self)._DidLoadDocument(action_runner)