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 fd26a2d9254a03c22d7cf11930cfb4ed033b995f..d479ecd6c02ac29bb9e38eab97a7c8458fda91c9 100644
--- a/tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py
+++ b/tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py
@@ -153,6 +153,18 @@ class ChromeProxyMetric(network_metrics.NetworkMetric):
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'request_bypassed', 'count', bypass_count))
 
+  def AddResultsForVersionTest(self, tab, results):
+    for resp in self.IterResponses(tab):
+      if resp.response.status != 200:
+        r = resp.response
+        raise ChromeProxyMetricException, ('%s: Response is not 200: %d' %
+                                           (r.url, r.status))
+      if not resp.IsValidByViaHeader():
+        raise ChromeProxyMetricException, ('%s: Response missing via header')
+    results.AddValue(scalar.ScalarValue(
+        results.current_page, 'version_test', 'count', 1))
+
+
   def IsProxyBypassed(self, tab):
     """ Returns True if all configured proxies are bypassed."""
     info = GetProxyInfoFromNetworkInternals(tab)