[tools/perf] Trim down story name that has more than 180 charaters

tools/perf/page_sets/top_desktop_sites_2012Q3.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 telemetry.page import page
 from telemetry import story
 
 
 TOP_2013_URLS = [
   'http://www.facebook.com/barackobama',
@@ skipping 233 matching lines @@
   'http://kakaku.com',
   'http://flipkart.com',
   'http://paipai.com'
   ]
 
 
 class Top2012Q3Page(page.Page):
 
   def __init__(self, url, ps):
     super(Top2012Q3Page, self).__init__(
-        url=url, page_set=ps, credentials_path = 'data/credentials.json')
+        url=url, page_set=ps, credentials_path = 'data/credentials.json',
+        name=url[:140])  # Make sure page's name is not too long
     self.archive_data_file = 'data/2012Q3.json'
 
   def RunPageInteractions(self, action_runner):
     with action_runner.CreateGestureInteraction('ScrollAction'):
       action_runner.ScrollPage()
 
 
 class Top2012Q3PageSet(story.StorySet):
   """ Pages hand-picked from top-lists in Q32012. """
 
   def __init__(self):
     super(Top2012Q3PageSet, self).__init__(
       archive_data_file='data/2012Q3.json',
       cloud_storage_bucket=story.PARTNER_BUCKET)
 
 
     for url in TOP_2013_URLS:
       self.AddStory(Top2012Q3Page(url, self))