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

tools/chrome_proxy/integration_tests/chrome_proxy_measurements.py

Index: tools/chrome_proxy/integration_tests/chrome_proxy_measurements.py
diff --git a/tools/chrome_proxy/integration_tests/chrome_proxy_measurements.py b/tools/chrome_proxy/integration_tests/chrome_proxy_measurements.py
index 7c05b9517ef276252dfb6421111ff10ac04a47e0..59903ddc8320b510f056ff3ef3964bd4ccb4a979 100644
--- a/tools/chrome_proxy/integration_tests/chrome_proxy_measurements.py
+++ b/tools/chrome_proxy/integration_tests/chrome_proxy_measurements.py
@@ -13,6 +13,20 @@ from metrics import loading
 from telemetry.core import exceptions, util
 from telemetry.page import page_test
 
+class ChromeProxyBypassOnTimeout(ChromeProxyValidation):
+  """Checks the client bypasses when endpoint site times out."""
+
+  def __init__(self):
+    super(ChromeProxyBypassOnTimeout, self).__init__(
+        restart_after_each_page=True,
+        metrics=metrics.ChromeProxyMetric())
+
+  def CustomizeBrowserOptions(self, options):
+    super(ChromeProxyBypassOnTimeout, self).CustomizeBrowserOptions(
+        options)
+
+  def AddResults(self, tab, results):
+    self._metrics.AddResultsForBypassOnTimeout(tab, results)
 
 class ChromeProxyDataSaving(page_test.PageTest):
   """Chrome proxy data saving measurement."""
@@ -677,4 +691,4 @@ class ChromeProxyPingback(ChromeProxyValidation):
       '--enable-stats-collection-bindings')
 
   def AddResults(self, tab, results):
-    self._metrics.AddResultsForPingback(tab, results)
+    self._metrics.AddResultsForPingback(tab, results)