Re-enable background:news:nytimes to examine crash

tools/perf/page_sets/system_health/background_stories.py

Index: tools/perf/page_sets/system_health/background_stories.py
diff --git a/tools/perf/page_sets/system_health/background_stories.py b/tools/perf/page_sets/system_health/background_stories.py
index ff16a87737efe91c938a10813ea5fad2b940deff..a30cbf0465ab4d15c78604514f7def7f32841ba6 100644
--- a/tools/perf/page_sets/system_health/background_stories.py
+++ b/tools/perf/page_sets/system_health/background_stories.py
@@ -6,9 +6,6 @@ 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):
@@ -42,7 +39,6 @@ class BackgroundFacebookMobileStory(_BackgroundStory):
   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'
@@ -64,6 +60,12 @@ class BackgroundNytimesMobileStory(_BackgroundStory):
     # Scroll to video, start it and then wait for a few seconds.
     action_runner.WaitForElement(selector='.nytd-player-poster')
     action_runner.ScrollPageToElement(selector='.nytd-player-poster')
+    # For some reason on some devices (e.g. Nexus7) we don't scroll all the way
+    # to the element. I think this might be caused by the page reflowing (due to
+    # vidoes loading) during the scroll. To be sure we get to the element
+    # wait a moment and then try to scroll again.
+    action_runner.Wait(1)
+    action_runner.ScrollPageToElement(selector='.nytd-player-poster')

[perezju, 2016/11/25 14:05:40]

I'm OK with this as a short-term fix, but sounds like like an issue that should
be fixed in ScrollPageToElement?

i.e. the method should check whether it actually scrolled to the thing it was
supposed to, and either retry (like here) or fix whatever is causing it not to
reach the element in the first place?

     action_runner.TapElement(selector='.nytd-player-poster')
     action_runner.Wait(_WAIT_FOR_VIDEO_SECONDS)