Implement the BadHTTPSFallback Integration Test with ChromeDriver

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 2b3259fe52f1590fb859e5c3e969bce54249b5d4..86785a5775652393c62a16f9822c45d75eb3d0b5 100644
--- a/tools/chrome_proxy/webdriver/bypass.py
+++ b/tools/chrome_proxy/webdriver/bypass.py
@@ -172,6 +172,23 @@ class Bypass(IntegrationTest):
       for response in responses:
         self.assertHasChromeProxyViaHeader(response)
 
+  # DataSaver uses a https proxy by default, if that fails it will fall back to 
+  # a http proxy

[RyanSturm, 2017/04/12 19:54:31]

nit: s/http/HTTP/ s/https/HTTPS/ s/proxy/proxy./ s/DataSaver/Data Saver/

+  def testBadHTTPSFallback(self):
+    with TestDriver() as test_driver:
+      test_driver.AddChromeArg('--enable-spdy-proxy-auth')
+      # Set the primary (https) proxy to a bad one.  
+      # That will force DataSaver to the http proxy for normal page requests.
+      test_driver.AddChromeArg('--spdy-proxy-auth-origin='
+                               'https://nonexistent.googlezip.net')          
+      test_driver.AddChromeArg('--data-reduction-proxy-http-proxies='                               

[bustamante, 2017/04/11 23:15:18]

Nit - trailing whitespace

+                               'http://compress.googlezip.net')  
+          
+      test_driver.LoadURL('http://check.googlezip.net/fallback/')
+      responses = test_driver.GetHTTPResponses()      
+      self.assertNotEqual(0, len(responses))
+      for response in responses:        
+        self.assertEqual(80, response.port)

[RyanSturm, 2017/04/12 19:54:31]

If you add "self.assertHasChromeProxyViaHeader(response)" does it pass? It would
be good to have if so.

 
 if __name__ == '__main__':
-  IntegrationTest.RunAllTests()
+  IntegrationTest.RunAllTests()