Integration test for data reduction proxy version header

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 3f765bf68ad8d10e4cb2509427d6e9816c7a64e6..541d6877e56815163f6ff9c37138f3d6696571e3 100644
--- a/tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py
+++ b/tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py
@@ -157,6 +157,19 @@ class ChromeProxyMetric(network_metrics.NetworkMetric):
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'request_bypassed', 'count', bypass_count))
 
+  def AddResultsForClientVersion(self, tab, results):
+    for resp in self.IterResponses(tab):
+      r = resp.response
+      if resp.response.status != 200:
+        raise ChromeProxyMetricException, ('%s: Response is not 200: %d' %
+                                           (r.url, r.status))
+      if not resp.IsValidByViaHeader():
+        raise ChromeProxyMetricException, ('%s: Response missing via header' %
+                                           (r.url))
+    results.AddValue(scalar.ScalarValue(
+        results.current_page, 'version_test', 'count', 1))
+
+
   def IsProxyBypassed(self, tab):
     """ Returns True if all configured proxies are bypassed."""
     if not tab: