[System Health] Disable stories failing on Android

tools/perf/page_sets/system_health/browsing_stories.py

Index: tools/perf/page_sets/system_health/browsing_stories.py
diff --git a/tools/perf/page_sets/system_health/browsing_stories.py b/tools/perf/page_sets/system_health/browsing_stories.py
index f8527e0634736fc3f57a5fc87f13e51b531ebfa8..8cbc0cc8b905865eea14a89fd0b9de45de053da8 100644
--- a/tools/perf/page_sets/system_health/browsing_stories.py
+++ b/tools/perf/page_sets/system_health/browsing_stories.py
@@ -96,6 +96,7 @@ class CnnStory(_NewsBrowsingStory):
   ITEMS_TO_VISIT = 2
 
 
+@decorators.Disabled('android')  # crbug.com/664518
 class FacebookMobileStory(_NewsBrowsingStory):
   NAME = 'browse:social:facebook'
   URL = 'https://www.facebook.com/rihanna'
@@ -184,6 +185,7 @@ class RedditMobileStory(_NewsBrowsingStory):
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
 
+@decorators.Disabled('android')  # crbug.com/664515
 class TwitterMobileStory(_NewsBrowsingStory):
   NAME = 'browse:social:twitter'
   URL = 'https://www.twitter.com/nasa'
@@ -256,6 +258,7 @@ class _MediaBrowsingStory(_BrowsingStory):
     action_runner.Wait(self.ITEM_VIEW_TIME_IN_SECONDS)
 
 
+@decorators.Disabled('android')  # crbug.com/664518
 class ImgurMobileStory(_MediaBrowsingStory):
   NAME = 'browse:media:imgur'
   URL = 'http://imgur.com/gallery/5UlBN'