Fail CT run_benchmark if archive_data_file is not found

tools/perf/page_sets/ct_page_set.py

 # Copyright 2015 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.
 
 
+import os
+
 from page_sets import repaint_helpers
 
 from telemetry.page import page as page_module
 from telemetry.page import shared_page_state
 from telemetry import story
 
 
 class CTPage(page_module.Page):
 
   def __init__(self, url, page_set, shared_page_state_class, archive_data_file):
     super(CTPage, self).__init__(
         url=url,
         page_set=page_set,
         shared_page_state_class=shared_page_state_class)
     self.archive_data_file = archive_data_file
 
   def RunNavigateSteps(self, action_runner):
     action_runner.Navigate(self.url)
     action_runner.Wait(2)
 
   def RunPageInteractions(self, action_runner):
     repaint_helpers.Repaint(action_runner)
 
 
 class CTPageSet(story.StorySet):
   """Page set used by CT Benchmarks."""
 
   def __init__(self, urls_list, user_agent, archive_data_file):
+    if archive_data_file and not os.path.exists(archive_data_file):
+      raise IOError('%s is not found' % archive_data_file)
+
     if user_agent == 'mobile':
       shared_page_state_class = shared_page_state.SharedMobilePageState
     elif user_agent == 'desktop':
       shared_page_state_class = shared_page_state.SharedDesktopPageState
     else:
       raise ValueError('user_agent %s is unrecognized' % user_agent)
 
     super(CTPageSet, self).__init__(archive_data_file=archive_data_file)
 
     for url in urls_list.split(','):
       self.AddStory(
           CTPage(url, self, shared_page_state_class, archive_data_file))