Bake in Python's unittest command line args.

tools/chrome_proxy/webdriver/simple_smoke.py

 # Copyright 2016 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 sys
 import time
 import unittest
 
 import common
 from common import TestDriver
@@ skipping 24 matching lines @@
   # Show how to use WaitForJavascriptExpression
   def testHTML5(self):
     with TestDriver() as t:
       t.AddChromeArg('--enable-spdy-proxy-auth')
       t.LoadURL('http://html5test.com/')
       t.WaitForJavascriptExpression(
         'document.getElementsByClassName("pointsPanel")', 15)
 
 if __name__ == '__main__':
   # The unittest library uses sys.argv itself and is easily confused by our
-  # command line options. Pass it a simpler argv instead.
-  unittest.main(argv=[sys.argv[0]], verbosity=2)
+  # command line options. Pass it a simpler argv instead, while working in the
+  # unittest command line args functionality.
+  flags = common.ParseFlags()
+  unittest.main(argv=[sys.argv[0]], verbosity=2, failfast=flags.failfast,
+    catchbreak=flags.catch, buffer=flags.buffer)