Bake in Python's unittest command line args.

tools/chrome_proxy/webdriver/simple_smoke.py

Index: tools/chrome_proxy/webdriver/simple_smoke.py
diff --git a/tools/chrome_proxy/webdriver/simple_smoke.py b/tools/chrome_proxy/webdriver/simple_smoke.py
index 27766c4b73948856442fb1b27095dfa13fa6864c..7d10956ffd49519c030475b8226fe502f9833fa7 100644
--- a/tools/chrome_proxy/webdriver/simple_smoke.py
+++ b/tools/chrome_proxy/webdriver/simple_smoke.py
@@ -42,5 +42,8 @@ class SimpleSmoke(unittest.TestCase):
 
 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)