Add Youtube auto play integration test

tools/chrome_proxy/webdriver/video.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 time
 
 import common
 from common import TestDriver
 from common import IntegrationTest
 
@@ skipping 99 matching lines @@
         self.fail('Could not get a compressed video after %d tries' % attempts)
       t.ExecuteJavascriptStatement('test.ready = true')
       wait_time = int(t.ExecuteJavascriptStatement('test.waitTime'))
       t.WaitForJavascriptExpression('test.metrics.complete', wait_time)
       metrics = t.ExecuteJavascriptStatement('test.metrics')
       if not metrics['complete']:
         raise Exception('Test not complete after %d seconds.' % wait_time)
       if metrics['failed']:
         raise Exception('Test failed!')
 
+  # Make sure YouTube autoplays.
+  def testYoutube(self):

[RyanSturm, 2017/02/21 18:37:48]

Desktop only?

+    with TestDriver() as t:
+      t.AddChromeArg('--enable-spdy-proxy-auth')
+      t.LoadURL('http://data-saver-test.appspot.com/youtube')
+      t.WaitForJavascriptExpression(
+        'window.playerState == YT.PlayerState.PLAYING', 30)
+      for response in t.GetHTTPResponses():
+        if not response.url.startswith('https'):
+          self.assertHasChromeProxyViaHeader(response)
+
 if __name__ == '__main__':
   IntegrationTest.RunAllTests()