Adding a smoke test for DataSaver

tools/chrome_proxy/webdriver/smoke.py

Index: tools/chrome_proxy/webdriver/smoke.py
diff --git a/tools/chrome_proxy/webdriver/smoke.py b/tools/chrome_proxy/webdriver/smoke.py
index 1da694c3891619c57c5a6e16f9692034a8e0f5df..78aba30bc60cd784c0e632517690e476a5e24862 100644
--- a/tools/chrome_proxy/webdriver/smoke.py
+++ b/tools/chrome_proxy/webdriver/smoke.py
@@ -33,6 +33,16 @@ class Smoke(IntegrationTest):
       self.assertEqual(2, len(responses))
       for response in responses:
         self.assertHasChromeProxyViaHeader(response)
+  
+  # Ensure Chrome uses DataSaver in normal mode.
+  def testCheckPageWithNormalMode(self):
+    with TestDriver() as t:
+      t.AddChromeArg('--enable-spdy-proxy-auth')
+      t.LoadURL('http://check.googlezip.net/test.html')
+      responses = t.GetHTTPResponses()
+      self.assertNotEqual(0, len(responses))
+      for response in responses:
+        self.assertHasChromeProxyViaHeader(response)
 
   # Ensure pageload metric pingback with DataSaver.
   def testPingback(self):