[NOT FOR COMMIT] Experiment wait 15 secs after load

tools/perf/page_sets/system_health/system_health_story.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 story_tags
 
 from telemetry import decorators
 from telemetry.page import page
 from telemetry.page import shared_page_state
 
 
 # Extra wait time after the page has loaded required by the loading metric. We
 # use it in all benchmarks to avoid divergence between benchmarks.
 # TODO(petrcermak): Switch the memory benchmarks to use it as well.
-_WAIT_TIME_AFTER_LOAD = 10
+_WAIT_TIME_AFTER_LOAD = 15
 
 
 class _SystemHealthSharedState(shared_page_state.SharedPageState):
   """Shared state which enables disabling stories on individual platforms.
 
   This class adds support for enabling/disabling individual stories on
   individual platforms using the same approaches as for benchmarks:
 
   **************
   *** DEPRECATED: Please use story expectations in ./exepctions.py to disable.
@@ skipping 107 matching lines @@
     pass
 
   def RunNavigateSteps(self, action_runner):
     self._Login(action_runner)
     super(SystemHealthStory, self).RunNavigateSteps(action_runner)
 
   def RunPageInteractions(self, action_runner):
     action_runner.tab.WaitForDocumentReadyStateToBeComplete()
     self._DidLoadDocument(action_runner)
     self._Measure(action_runner)