Fix errors when running against staging

tools/chrome_proxy/webdriver/lofi.py

 # Copyright 2017 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import common
 from common import TestDriver
 from common import IntegrationTest
 
 
 class LoFi(IntegrationTest):
@@ skipping 27 matching lines @@
   # reloads when Lo-Fi mode is disabled or data reduction proxy is disabled.
   # First a test page is opened with Lo-Fi and chrome proxy enabled. This allows
   # Chrome to cache the Lo-Fi placeholder image. The browser is restarted with
   # chrome proxy disabled and the same test page is loaded. This second page
   # load should not pick the Lo-Fi placeholder from cache and original image
   # should be loaded. Finally, the browser is restarted with chrome proxy
   # enabled and Lo-Fi disabled and the same test page is loaded. This third page
   # load should not pick the Lo-Fi placeholder from cache and original image
   # should be loaded.
   def testLoFiCacheBypass(self):
+    # If it was attempted to run with another experiment, skip this test.
+    if common.ParseFlags().browser_args and ('--data-reduction-proxy-experiment'
+        in common.ParseFlags().browser_args):
+      self.skipTest('This test cannot be run with other experiments.')
     with TestDriver() as test_driver:
       # First page load, enable Lo-Fi and chrome proxy. Disable server
       # experiments such as tamper detection. This test should be run with
       # --profile-type=default command line for the same user profile and cache
       # to be used across the two page loads.
       test_driver.AddChromeArg('--enable-spdy-proxy-auth')
       test_driver.AddChromeArg('--data-reduction-proxy-lo-fi=always-on')
       test_driver.AddChromeArg('--profile-type=default')
       test_driver.AddChromeArg('--data-reduction-proxy-server-experiments-'
                                'disabled')
@@ skipping 45 matching lines @@
           continue
         responses = responses + 1
         self.assertHasChromeProxyViaHeader(response)
         self.checkLoFiResponse(response, False)
 
       # Verify that responses were seen.
       self.assertNotEqual(0, responses)
 
 if __name__ == '__main__':
   IntegrationTest.RunAllTests()