Introduce PageCyclerStory and let the stories wait for onload+TTI

tools/perf/page_sets/intl_ar_fa_he.py

Index: tools/perf/page_sets/intl_ar_fa_he.py
diff --git a/tools/perf/page_sets/intl_ar_fa_he.py b/tools/perf/page_sets/intl_ar_fa_he.py
index cc8f597c07114531599a995c2e903f2e221d7b59..a86fec401dfe28ac1a772776ddf4a3ae197afc5d 100644
--- a/tools/perf/page_sets/intl_ar_fa_he.py
+++ b/tools/perf/page_sets/intl_ar_fa_he.py
@@ -1,13 +1,14 @@
 # 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
 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 IntlArFaHePage(page_module.Page):
+class IntlArFaHePage(page_cycler_story.PageCyclerStory):
 
   def __init__(self, url, page_set, cache_temperature=None):
     super(IntlArFaHePage, self).__init__(