[system-health] Add support for disabling individual stories on individual platforms

tools/perf/page_sets/system_health/loading_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.login_helpers import dropbox_login
 from page_sets.login_helpers import google_login
 
+from telemetry import decorators
+
 
 class _LoadingStory(system_health_story.SystemHealthStory):
   """Abstract base class for single-page System Health user stories."""
   ABSTRACT_STORY = True
 
 
 ################################################################################
 # Search and e-commerce.
 ################################################################################
 # TODO(petrcermak): Split these into 'portal' and 'shopping' stories.
@@ skipping 52 matching lines @@
   # Using Facebook login often causes "404 Not Found" with WPR.
   NAME = 'load:social:facebook'
   URL = 'https://www.facebook.com/rihanna'
 
 
 class LoadTwitterStory(_LoadingStory):
   NAME = 'load:social:twitter'
   URL = 'https://www.twitter.com/nasa'
 
 
+# Due to the deterministic date injected by WPR (February 2008), the cookie set
+# by https://vk.com immediately expires, so the page keeps refreshing
+# indefinitely on mobile
+# (see https://github.com/chromium/web-page-replay/issues/71).
+@decorators.Disabled('android')
 class LoadVkStory(_LoadingStory):
   NAME = 'load:social:vk'
   URL = 'https://vk.com/sbeatles'
-  # Due to the deterministic date injected by WPR (February 2008), the cookie
-  # set by https://vk.com immediately expires, so the page keeps refreshing
-  # indefinitely on mobile
-  # (see https://github.com/chromium/web-page-replay/issues/71).
-  SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY
 
 
 class LoadInstagramStory(_LoadingStory):
   NAME = 'load:social:instagram'
   URL = 'https://www.instagram.com/selenagomez/'
 
 
 class LoadPinterestStory(_LoadingStory):
   NAME = 'load:social:pinterest'
   URL = 'https://uk.pinterest.com/categories/popular/'
@@ skipping 55 matching lines @@
   URL = 'https://www.reddit.com/r/news/top/?sort=top&t=week'
   SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY
 
 
 class LoadRedditMobileStory(_LoadingStory):
   NAME = 'load:news:reddit'
   URL = 'https://www.reddit.com/r/news/top/?sort=top&t=week'
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
 
-class LoadSohuStory(_LoadingStory):
+class LoadSohuMobileStory(_LoadingStory):
   NAME = 'load:news:sohu'
   # Using "https://" leads to missing images and scripts on mobile (due to
   # mixed content).
   URL = 'http://m.sohu.com/n/447433356/'
   # The desktop page (http://news.sohu.com/20160503/n447433356.shtml) almost
   # always fails to completely load due to
   # https://github.com/chromium/web-page-replay/issues/74.
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
 
@@ skipping 72 matching lines @@
   URL = 'http://imgur.com/gallery/5UlBN'
 
 
 class LoadFacebookPhotosMobileStory(_LoadingStory):
   NAME = 'load:media:facebook_photos'
   URL = (
       'https://m.facebook.com/rihanna/photos/a.207477806675.138795.10092511675/10153911739606676/?type=3&source=54&ref=page_internal')
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
 
+# Recording currently does not work. The page gets stuck in the theater viewer.
+@decorators.Disabled('all')
 class LoadFacebookPhotosDesktopStory(_LoadingStory):
   NAME = 'load:media:facebook_photos'
   URL = (
       'https://www.facebook.com/rihanna/photos/a.207477806675.138795.10092511675/10153911739606676/?type=3&theater')
-  # Recording currently does not work. The page gets stuck in the
-  # theater viewer.
-  SUPPORTED_PLATFORMS = platforms.NO_PLATFORMS
+  SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY
 
 
 ################################################################################
 # Online tools (documents, emails, storage, ...).
 ################################################################################
 
 
 class LoadDocsStory(_LoadingStory):
   NAME = 'load:tools:docs'
   URL = (
@@ skipping 106 matching lines @@
     # The background of the game canvas is set when the "Tap screen to play"
     # caption is displayed.
     action_runner.WaitForJavaScriptCondition(
         'document.querySelector("#game canvas").style.background !== ""')
 
 
 class LoadMiniclipStory(_LoadingStory):
   NAME = 'load:games:miniclip'
   # Using "https://" causes "404 Not Found" during WPR recording.
   URL = 'http://www.miniclip.com/games/en/'
-  # Desktop only (requires Flash).
-  SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY
+  SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY  # Requires Flash.
 
 
 class LoadAlphabettyStory(_LoadingStory):
   NAME = 'load:games:alphabetty'
   URL = 'https://king.com/play/alphabetty'
-  # Desktop only (requires Flash).
-  SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY
+  SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY  # Requires Flash.