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

tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py

Index: tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py
diff --git a/tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py b/tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py
index 9c12daa1c4781d54ce840f90646d562c81ff11c0..af6dbacc03174e41238e92d2519250e1ba99b4fe 100644
--- a/tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py
+++ b/tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py
@@ -872,6 +872,26 @@ class ChromeProxyMetric(network_metrics.NetworkMetric):
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'succeeded_sum', 'count', succeeded))
 
+  def AddResultsForBypassOnTimeout(self, tab, results):
+    bypass_count = 0
+    # It should not take more than 90 seconds to bypass the origin for sake of
+    # user experience, keeping in mind poor connections.
+    tab.WaitForDocumentReadyStateToBeComplete(timeout=90)
+    for resp in self.IterResponses(tab):
+      if resp.HasChromeProxyViaHeader() and not resp.response.url.endswith(
+          'favicon.ico'):
+        r = resp.response
+        raise ChromeProxyMetricException, (
+            'Response for %s should not have via header after HTTP timeout.\n'
+            'Reponse: status=(%d)\nHeaders:\n %s' % (
+                r.url, r.status, r.headers))
+      elif not resp.response.url.endswith('favicon.ico'):
+        bypass_count += 1
+    if bypass_count == 0:
+      raise ChromeProxyMetricException('No pages were tested!')
+    results.AddValue(scalar.ScalarValue(
+        results.current_page, 'bypass', 'count', bypass_count))
+
 PROXIED = 'proxied'
 DIRECT = 'direct'