Add System health stories for Emerging market

tools/perf/page_sets/system_health/searching_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 system_health_story
+from page_sets.system_health import platforms
 
 
 class SearchGoogleStory(system_health_story.SystemHealthStory):
   NAME = 'search:portal:google'
   URL = 'https://www.google.co.uk/'
 
   _SEARCH_BOX_SELECTOR = 'input[aria-label="Search"]'
   _RESULT_SELECTOR = '.r > a[href*="wikipedia"]'
 
   def _DidLoadDocument(self, action_runner):
@@ skipping 10 matching lines @@
 
     # Scroll to the Wikipedia result.
     action_runner.WaitForElement(selector=self._RESULT_SELECTOR)
     action_runner.Wait(1)
     action_runner.ScrollPageToElement(selector=self._RESULT_SELECTOR)
 
     # Click on the Wikipedia result.
     action_runner.Wait(1)
     action_runner.TapElement(selector=self._RESULT_SELECTOR)
     action_runner.tab.WaitForDocumentReadyStateToBeComplete()
+
+class SearchOmniboxStory(system_health_story.SystemHealthStory):
+  NAME = 'search:google:omnibox'
+  URL = 'https://www.google.co.in'
+
+  def RunPageInteractions(self, action_runner):
+    platform = action_runner.tab.browser.platform
+    package = action_runner.tab.browser.GetBrowserInfo().package_name
+    platform.system_ui.WaitForUiNode(resource_id=package+':id/url_bar')
+    url_bar = platform.system_ui.GetUiNode(resource_id=package+':id/url_bar')
+    url_bar.Tap()
+    action_runner.Wait(1)
+    # Enter system input as action_runner input does not work for browser
+    # activity.
+    platform.device.RunShellCommand(['input', 'text', 'drake'],

[nednguyen, 2017/03/31 08:56:55]

Hmhh, this should be using
https://github.com/catapult-project/catapult/blob/master/telemetry/telemetry/...

I am shocked that we expose the "device" API directly to user. +perezju@

[ssid, 2017/04/04 03:43:48]

Sorry I did not notice we have different action runner.
I was planning to expose device in platform to be able to do this. Fixed this.

[perezju, 2017/04/04 09:23:38]

I've filed https://github.com/catapult-project/catapult/issues/3469

+                                    check_return=True)
+    action_runner.Wait(0.5)
+    platform.device.RunShellCommand(['input', 'keyevent', '66'],
+                                    check_return=True)
+
+    action_runner.WaitForNavigate(15)
+    action_runner.ScrollPage(use_touch=True, distance=500)
+
+  SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY