Added a timezone policy and pyauto tests for it.

chrome/test/pyautolib/pyauto.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.
 
 """PyAuto: Python Interface to Chromium's Automation Proxy.
 
 PyAuto uses swig to expose Automation Proxy interfaces to Python.
 For complete documentation on the functionality available,
 run pydoc on this file.
@@ skipping 5581 matching lines @@
     cmd_dict = { 'command': 'GetTimeInfo' }
     if self.GetLoginInfo()['is_logged_in']:
       return self._GetResultFromJSONRequest(cmd_dict, windex=windex)
     else:
       return self._GetResultFromJSONRequest(cmd_dict, windex=None)
 
   def SetTimezone(self, timezone):
     """Sets the timezone on ChromeOS. A user must be logged in.
 
     The timezone is the relative path to the timezone file in
-    /usr/share/zoneinfo. For example, /usr/share/zoneinfo/America/Los_Angeles
-    is 'America/Los_Angeles'.
+    /usr/share/zoneinfo. For example, /usr/share/zoneinfo/America/Los_Angeles is
+    'America/Los_Angeles'. For a list of valid timezones see
+    'chrome/browser/chromeos/system/timezone_settings.cc'.
 
     This method does not return indication of success or failure.
-    If the timezone is invalid, it falls back to UTC/GMT.
+    If the timezone is it falls back to a valid timezone.
 
     Raises:
       pyauto_errors.JSONInterfaceError if the automation call returns an error.
     """
     cmd_dict = {
         'command': 'SetTimezone',
         'timezone': timezone,
     }
     self._GetResultFromJSONRequest(cmd_dict, windex=None)
 
@@ skipping 928 matching lines @@
     successful = result.wasSuccessful()
     if not successful:
       pyauto_tests_file = os.path.join(self.TestsDir(), self._tests_filename)
       print >>sys.stderr, 'Tests can be disabled by editing %s. ' \
                           'Ref: %s' % (pyauto_tests_file, _PYAUTO_DOC_URL)
     sys.exit(not successful)
 
 
 if __name__ == '__main__':
   Main()