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 04740c5d6e8b4a687c32f75fad053dce207efc57..1d7b6947bc6ae991cf8a2960f9bcc7b85b0fbb50 100644
--- a/tools/chrome_proxy/integration_tests/chrome_proxy_benchmark.py
+++ b/tools/chrome_proxy/integration_tests/chrome_proxy_benchmark.py
@@ -10,6 +10,20 @@ from telemetry import benchmark
 DESKTOP_PLATFORMS = ['mac', 'linux', 'win', 'chromeos']
 WEBVIEW_PLATFORMS = ['android-webview', 'android-webview-shell']
 
+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
@@ -316,4 +330,4 @@ class ChromeProxyPingback(ChromeProxyBenchmark):
 
   @classmethod
   def Name(cls):
-    return 'chrome_proxy_benchmark.pingback'
+    return 'chrome_proxy_benchmark.pingback'