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

tools/chrome_proxy/integration_tests/chrome_proxy_benchmark.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 common.chrome_proxy_benchmark import ChromeProxyBenchmark
 from integration_tests import chrome_proxy_measurements as measurements
 from integration_tests import chrome_proxy_pagesets as pagesets
 from telemetry import benchmark
 
 DESKTOP_PLATFORMS = ['mac', 'linux', 'win', 'chromeos']
 WEBVIEW_PLATFORMS = ['android-webview', 'android-webview-shell']
 
 
 class ChromeProxyBypassOnTimeout(ChromeProxyBenchmark):
   """Check that the proxy bypasses when origin times out.
 
   If the origin site does not make an HTTP response in a reasonable
   amount of time, the proxy should bypass.
   """
   tag = 'timeout_bypass'
   test = measurements.ChromeProxyBypassOnTimeout
   page_set = pagesets.BypassOnTimeoutStorySet
 
   @classmethod
   def Name(cls):
     return 'chrome_proxy_benchmark.timeout_bypass.timeout_bypass'
 
+class ChromeProxyBadHTTPSFallback(ChromeProxyBenchmark):
+  """Check that the client falls back to HTTP on bad HTTPS response.
+
+  If the HTTPS proxy responds with a bad response code (like 500) then the
+  client should fallback to HTTP.
+  """
+  tag = 'badhttps_bypass'
+  test = measurements.ChromeProxyBadHTTPSFallback
+  page_set = pagesets.SyntheticStorySet
+
+  @classmethod
+  def Name(cls):
+    return 'chrome_proxy_benchmark.badhttps_fallback.badhttps_fallback'
+
 class ChromeProxyClientType(ChromeProxyBenchmark):
   tag = 'client_type'
   test = measurements.ChromeProxyClientType
   page_set = pagesets.ClientTypeStorySet
 
   @classmethod
   def Name(cls):
     return 'chrome_proxy_benchmark.client_type.client_type'
 
 
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 class ChromeProxyPingback(ChromeProxyBenchmark):
   """Check that the pingback is sent and the server responds. """
   tag = 'pingback'
   test = measurements.ChromeProxyPingback
   page_set = pagesets.PingbackStorySet
 
   @classmethod
   def Name(cls):
     return 'chrome_proxy_benchmark.pingback'