[autotest] Ensure that ownership state is properly cleaned during test setup

client/cros/cros_ui.py

 # Copyright (c) 2010 The Chromium OS 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 logging, os, shutil
 import common
 import constants, httpd, login
 
 from autotest_lib.client.bin import utils
 from autotest_lib.client.common_lib import error
@@ skipping 47 matching lines @@
     # tries to connect to the X server before the .Xauthority file has been
     # created; see http://crosbug.com/12389.
     utils.poll_for_condition(
         lambda: os.path.exists(xauth_filename),
         utils.TimeoutError('Timed out waiting for %s.' % xauth_filename))
 
     import autox
     return autox.AutoX()
 
 
+def stop():
+    return utils.system("stop ui")
+
+
+def start():
+    return utils.system("start ui")
+
+
 class ChromeSession(object):
     """
     A class to open a tab within the running browser process.
     """
 
     def __init__(self, args=''):
         self.start(args)
 
 
     def start(self, args=''):
@@ skipping 114 matching lines @@
         entries = http_server.get_form_entries()
         http_server.stop()
         return entries
 
 
     def get_result(self):
         entries = self.get_entries()
         if not entries:
             return None
         return entries.get('result')