Add HTML5 integration test

tools/chrome_proxy/webdriver/html5.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 HTML5(IntegrationTest):
+
+  # This test site has a div with id="pointsPanel" that is rendered if the
+  # browser is capable of using HTML5.
+  def testHTML5(self):
+    with TestDriver() as t:
+      t.AddChromeArg('--enable-spdy-proxy-auth')
+      t.LoadURL('http://html5test.com/')
+      t.WaitForJavascriptExpression(
+        'document.getElementsByClassName("pointsPanel")', 15)
+      checked_main_page = False
+      for response in t.GetHTTPResponses():
+        # Site has a lot on it, just check the main page.
+        if (response.url == 'http://html5test.com/'
+            or response.url == 'http://html5test.com/index.html'):
+          self.assertHasChromeProxyViaHeader(response)
+          checked_main_page = True
+      if not checked_main_page:
+        self.fail("Did not check any page!")
+if __name__ == '__main__':
+  IntegrationTest.RunAllTests()