Introduce PageCyclerStory and let the stories wait for onload+TTI

tools/perf/page_sets/intl_es_fr_pt-BR.py

 # 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 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 IntlEsFrPtBrPage(page_module.Page):
+class IntlEsFrPtBrPage(page_cycler_story.PageCyclerStory):
 
   def __init__(self, url, page_set, cache_temperature=None):
     super(IntlEsFrPtBrPage, self).__init__(
         url=url, page_set=page_set,
         shared_page_state_class=shared_page_state.SharedDesktopPageState,
         cache_temperature=cache_temperature)
     self.archive_data_file = 'data/intl_es_fr_pt-BR.json'
 
 
 class IntlEsFrPtBrPageSet(story.StorySet):
@@ skipping 22 matching lines @@
       # Why: #5 site in Brazil
       'http://www.uol.com.br/',
       # Why: #10 site in Brazil
       # pylint: disable=line-too-long
       'http://produto.mercadolivre.com.br/MLB-468424957-pelicula-protetora-smartphone-h5500-e-h5300-43-frete-free-_JM'
     ]
 
     for url in urls_list:
       for temp in cache_temperatures:
         self.AddStory(IntlEsFrPtBrPage(url, self, cache_temperature=temp))