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

Index: tools/chrome_proxy/integration_tests/chrome_proxy_benchmark.py
diff --git a/tools/chrome_proxy/integration_tests/chrome_proxy_benchmark.py b/tools/chrome_proxy/integration_tests/chrome_proxy_benchmark.py
index 70aa55bcb8b23683cdd8da9db9d8b25a915e5ed1..932ac39627965094bb089911369f768782565193 100644
--- a/tools/chrome_proxy/integration_tests/chrome_proxy_benchmark.py
+++ b/tools/chrome_proxy/integration_tests/chrome_proxy_benchmark.py
@@ -25,6 +25,20 @@ class ChromeProxyBypassOnTimeout(ChromeProxyBenchmark):
   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.BadHTTPSFallbackStorySet
+
+  @classmethod
+  def Name(cls):
+    return 'chrome_proxy_benchmark.badhttps_fallback.badhttps_fallback'
+
 class ChromeProxyClientType(ChromeProxyBenchmark):
   tag = 'client_type'
   test = measurements.ChromeProxyClientType