Added a timezone policy and pyauto tests for it.

chrome/test/functional/chromeos_time.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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 logging
 import sys
 
 import pyauto_functional  # Must be imported before pyauto
 import pyauto
@@ skipping 50 matching lines @@
     """)
     return ret == 'false'
 
   def testTimezoneIsEditable(self):
     """Test that the timezone is always editable."""
     # This test only makes sense if we are not running as the owner.
     self.assertFalse(self.GetLoginInfo()['is_owner'])
     editable = self._IsTimezoneEditable()
     self.assertTrue(editable, msg='Timezone is not editable when not owner.')
 
+  def _SetTimezoneInUI(self, timezone):
+    self.NavigateToURL('chrome://settings-frame/settings')
+    self.ExecuteJavascript("""
+        var selectElement = document.getElementById('timezone-select');
+        selectElement.value = "%s";
+        var event = document.createEvent("HTMLEvents");
+        event.initEvent("change", true, true);
+        selectElement.dispatchEvent(event);
+        domAutomationController.send("");
+    """ % timezone)
+
+  def testSetTimezoneUI(self):
+    """Test that the timezone UI changes internal settings.
+
+    Set the Timezone on the settings page. Check the internal timezone
+    afterwards. Timezones should be always editable."""
+
+    for timezone in ['America/Barbados', 'Europe/Helsinki']:
+      self._SetTimezoneInUI(timezone)
+      self.assertTrue(
+          self.WaitUntil(lambda: timezone == self.GetTimeInfo()['timezone']),
+          'Timezone not changed as expected.');
 
 if __name__ == '__main__':
   pyauto_functional.Main()