Introduce PageCyclerStory and let the stories wait for onload+TTI

tools/perf/page_sets/intl_ko_th_vi.py

Index: tools/perf/page_sets/intl_ko_th_vi.py
diff --git a/tools/perf/page_sets/intl_ko_th_vi.py b/tools/perf/page_sets/intl_ko_th_vi.py
index a065f74e12e0caafa18f64f8805f18337beba36c..7c437c39b01f01354030a818a8ec4842dab5380e 100644
--- a/tools/perf/page_sets/intl_ko_th_vi.py
+++ b/tools/perf/page_sets/intl_ko_th_vi.py
@@ -1,13 +1,13 @@
 # Copyright 2014 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 import page_cycler_story

[petrcermak, 2016/08/15 10:49:30]

ditto

[kouhei (in TOK), 2016/08/22 06:09:21]

Done.

+from telemetry import story
 from telemetry.page import cache_temperature as cache_temperature_module
-from telemetry.page import page as page_module
 from telemetry.page import shared_page_state
-from telemetry import story
 
 
-class IntlKoThViPage(page_module.Page):
+class IntlKoThViPage(page_cycler_story.PageCyclerStory):
 
   def __init__(self, url, page_set, cache_temperature=None):
     super(IntlKoThViPage, self).__init__(