Add integration tests for QUIC

tools/chrome_proxy/integration_tests/chrome_proxy_pagesets/quic.py

 # Copyright 2016 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 as page_module
 from telemetry import story
 
 
-class PingbackPage(page_module.Page):
+class QuicPage(page_module.Page):
 
   def __init__(self, url, page_set):
-    super(PingbackPage, self).__init__(url=url, page_set=page_set)
+    super(QuicPage, self).__init__(url=url, page_set=page_set)
 
 
-class PingbackStorySet(story.StorySet):
+class QuicStorySet(story.StorySet):
 
-  """ Chrome proxy test page to verify the pingback """
+  """ Chrome proxy test page to verify the QUIC proxy usage """
 
   def __init__(self):
-    super(PingbackStorySet, self).__init__()
+    super(QuicStorySet, self).__init__()
 
     urls_list = [
       'http://check.googlezip.net/test.html',
     ]
 
     for url in urls_list:
-      self.AddStory(PingbackPage(url, self))
+      self.AddStory(QuicPage(url, self))