Added integration test to Chrome Proxy to verify fallback to HTTP after bad HTTPS response from pro…

tools/chrome_proxy/integration_tests/chrome_proxy_measurements.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.
 
 import base64
 import logging
 import urlparse
 
 from common import chrome_proxy_measurements as measurements
 from common.chrome_proxy_measurements import ChromeProxyValidation
@@ skipping 177 matching lines @@
     queries.append('respBody=%s' % base64.b64encode(respBody))
   if len(queries) == 0:
     return url
   "&".join(queries)
   # url has query already
   if urlparse.urlparse(url).query:
     return url + '&' + "&".join(queries)
   else:
     return url + '?' + "&".join(queries)
 
+class ChromeProxyBadHTTPSFallback(ChromeProxyValidation):
+  """Checks the client falls back to HTTP proxy when HTTPS proxy errors."""
+
+  def __init__(self):
+    super(ChromeProxyBadHTTPSFallback, self).__init__(
+        restart_after_each_page=True,
+        metrics=metrics.ChromeProxyMetric())
+    self._is_chrome_proxy_enabled = True
+
+  def CustomizeBrowserOptions(self, options):
+    super(ChromeProxyBadHTTPSFallback, self).CustomizeBrowserOptions(
+        options)
+
+  def AddResults(self, tab, results):
+    self._metrics.AddResultsForBadHTTPSFallback(tab, results)
 
 class ChromeProxyHTTPFallbackProbeURL(ChromeProxyValidation):
   """Correctness measurement for proxy fallback.
 
   In this test, the probe URL does not return 'OK'. Chrome is expected
   to use the fallback proxy.
   """
 
   def __init__(self):
     super(ChromeProxyHTTPFallbackProbeURL, self).__init__(
@@ skipping 477 matching lines @@
 
   def CustomizeBrowserOptions(self, options):
     super(ChromeProxyPingback, self).CustomizeBrowserOptions(options)
     options.AppendExtraBrowserArgs(
       '--enable-data-reduction-proxy-force-pingback')
     options.AppendExtraBrowserArgs(
       '--enable-stats-collection-bindings')
 
   def AddResults(self, tab, results):
     self._metrics.AddResultsForPingback(tab, results)