Adding a CORS bypass integration test

tools/chrome_proxy/webdriver/bypass.py

Index: tools/chrome_proxy/webdriver/bypass.py
diff --git a/tools/chrome_proxy/webdriver/bypass.py b/tools/chrome_proxy/webdriver/bypass.py
index d7d1b0c48941ba8ad4b5675bbaa23361b263ce40..3d5f3989d2a1c7061cd19f035555cd432862192d 100644
--- a/tools/chrome_proxy/webdriver/bypass.py
+++ b/tools/chrome_proxy/webdriver/bypass.py
@@ -23,5 +23,31 @@ class Bypass(IntegrationTest):
       for response in t.GetHTTPResponses():
         self.assertNotHasChromeProxyViaHeader(response)
 
+  # Verify that CORS requests receive a block-once from the data reduction
+  # proxy by checking that those requests are retried without data reduction
+  # proxy.
+  def testCorsBypass(self):
+    with TestDriver() as test_driver:
+      test_driver.AddChromeArg('--enable-spdy-proxy-auth')
+      test_driver.LoadURL('http://www.gstatic.com/chrome/googlezip/cors/')
+
+      # Navigate to a different page to verify that later requests are not
+      # blocked.
+      test_driver.LoadURL('http://check.googlezip.net/test.html')
+
+      cors_requests = 0
+      same_origin_requests = 0
+      for response in test_driver.GetHTTPResponses():
+        # The origin header implies that |response| is a CORS request.
+        if ('origin' not in response.request_headers):
+          self.assertHasChromeProxyViaHeader(response)
+          same_origin_requests = same_origin_requests + 1
+        else:
+          self.assertNotHasChromeProxyViaHeader(response)
+          cors_requests = cors_requests + 1
+      # Verify that both CORS and same origin requests were seen.
+      self.assertNotEqual(0, same_origin_requests)
+      self.assertNotEqual(0, cors_requests)
+
 if __name__ == '__main__':
   IntegrationTest.RunAllTests()