Add integration tests for QUIC

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 70051f854cfb03f718e6bd9a5ccb0c96f8ef5a58..ee2b103ccac1c29e6ac65733fda017dc6c1aebd7 100644
--- a/tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py
+++ b/tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import json
 import logging
 import os
 import time
@@ -872,6 +873,53 @@ class ChromeProxyMetric(network_metrics.NetworkMetric):
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'succeeded_sum', 'count', succeeded))
 
+  def AddResultsForQuicTransaction(self, tab, results):
+    histogram_type = histogram_util.BROWSER_HISTOGRAM
+    # This histogram should be synchronously created when the Navigate occurs.
+    # Verify that histogram DataReductionProxy.Quic.ProxyStatus has no samples
+    # in bucket >=1.
+    fail_counts_proxy_status = histogram_util.GetHistogramSum(
+        histogram_type,
+        'DataReductionProxy.Quic.ProxyStatus',
+        tab)
+    if fail_counts_proxy_status != 0:
+      raise ChromeProxyMetricException, (
+          'fail_counts_proxy_status is %d.' % fail_counts_proxy_status)
+
+    # Verify that histogram DataReductionProxy.Quic.ProxyStatus has at least 1
+    # sample. This sample must be in bucket 0 (QUIC_PROXY_STATUS_AVAILABLE).
+    success_counts_proxy_status = histogram_util.GetHistogramCount(
+        histogram_type,
+        'DataReductionProxy.Quic.ProxyStatus',
+        tab)
+    if success_counts_proxy_status <= 0:
+      raise ChromeProxyMetricException, (
+          'success_counts_proxy_status is %d.' % success_counts_proxy_status)
+
+    # Navigate to one more page to ensure that established QUIC connection
+    # is used for the next request. Give 1 second extra headroom for the QUIC
+    # connection to be established.
+    time.sleep(1)
+    tab.Navigate('http://check.googlezip.net/test.html')
+
+    proxy_usage_histogram_json = histogram_util.GetHistogram(histogram_type,
+        'Net.QuicAlternativeProxy.Usage',
+        tab)
+    proxy_usage_histogram = json.loads(proxy_usage_histogram_json)
+
+    # Bucket ALTERNATIVE_PROXY_USAGE_NO_RACE should have at least one sample.
+    if proxy_usage_histogram['buckets'][0]['count'] <= 0:
+      raise ChromeProxyMetricException, (
+          'Number of samples in ALTERNATIVE_PROXY_USAGE_NO_RACE bucket is %d.'
+             % proxy_usage_histogram['buckets'][0]['count'])
+
+    results.AddValue(scalar.ScalarValue(
+        results.current_page, 'fail_counts_proxy_status', 'count',
+        fail_counts_proxy_status))
+    results.AddValue(scalar.ScalarValue(
+        results.current_page, 'success_counts_proxy_status', 'count',
+        success_counts_proxy_status))
+
   def AddResultsForBypassOnTimeout(self, tab, results):
     bypass_count = 0
     # Wait maximum of 120 seconds for test to complete. Should complete soon