Added integration test to Chrome Proxy to verify direct connection on remote site timeout

tools/chrome_proxy/integration_tests/chrome_proxy_pagesets/http_timeout.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 BypassOnTimeoutPage(page_module.Page):
+
+  def __init__(self, url, page_set):
+    super(BypassOnTimeoutPage, self).__init__(url=url, page_set=page_set)
+
+
+class BypassOnTimeoutStorySet(story.StorySet):
+  """This site takes 60s to respond when being accessed by proxy."""
+
+  def __init__(self):
+    super(BypassOnTimeoutStorySet, self).__init__()
+
+    urls_list = [
+      'http://chromeproxy-test.appspot.com/blackhole'
+    ]
+
+    for url in urls_list:
+      self.AddStory(BypassOnTimeoutPage(url, self))