[system health] Fix load:news:washingtonpost and browse:news:washingtonpost on Nexus9.

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 388e0ee5c3ea0c46d6988163c40715dbe8192216..9611e927ea95e83bbc0f42aea8cf2bec68ecd888 100644
--- a/tools/perf/page_sets/system_health/browsing_stories.py
+++ b/tools/perf/page_sets/system_health/browsing_stories.py
@@ -182,6 +182,9 @@ class WashingtonPostMobileStory(_NewsBrowsingStory):
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
   def _DidLoadDocument(self, action_runner):
-    # Close the popup window.
-    action_runner.ClickElement(selector='.close')
+    # Close the popup window. On Nexus 9 (and probably other tables) the popup

[petrcermak, 2016/07/19 16:51:58]

How about we do something a little more hacky:

action_runner.ExecuteJavaScript('''(function() {
      var elem = document.querySelector('div#welcome');
      if (elem)
        elem.parentNode.removeChild(elem);
    })()''');

[ulan, 2016/07/19 17:26:42]

Acknowledged.

+    # window does not have "Close" button, instead it has only "Send link to

[petrcermak, 2016/07/19 17:07:08]

supernit: s/have "Close"/have a "Close/ and s/only "Send/only a "Send/

[ulan, 2016/07/19 17:26:42]

Done.

+    # phone" button, which does nothing. So on tablets we run with popup

[petrcermak, 2016/07/19 17:07:08]

nit: s/popup/the popup/

[ulan, 2016/07/19 17:26:42]

Done.

+    # window open.

[petrcermak, 2016/07/19 17:07:08]

Please add a sentence (along the lines of your reply): "The popup is
transparent, so this is mostly an aesthetical issue."

[ulan, 2016/07/19 17:26:42]

Done.

+    action_runner.ClickElement(selector='.close,.mailBlock')

[petrcermak, 2016/07/19 17:08:48]

On a second thought, I think it would be better not to click any button if
there's no "close" button.

[ulan, 2016/07/19 17:26:42]

Done. Added a check.

     super(WashingtonPostMobileStory, self)._DidLoadDocument(action_runner)