Update git_cl to look at right Tree Status URL for Chromium OS

git_cl/git_cl.py

 #!/usr/bin/python
 # git-cl -- a git-command for integrating reviews on Rietveld
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
 import errno
 import logging
 import optparse
 import os
 import re
 import subprocess
 import sys
 import tempfile
 import textwrap
 import upload
+import urlparse
 import urllib2
 
 try:
   import readline
 except ImportError:
   pass
 
 try:
   # Add the parent directory in case it's a depot_tools checkout.
   depot_tools_path = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
@@ skipping 1145 matching lines @@
   except ImportError:
     try:
       import json
       # Some versions of python2.5 have an incomplete json module. Check to make
       # sure loads exists.
       json.loads
     except (ImportError, AttributeError):
       print >> sys.stderr, 'Please install simplejson'
       sys.exit(1)
 
-  json_url = 'http://chromium-status.appspot.com/current?format=json'
+  url = settings.GetTreeStatusUrl()
+  json_url = urlparse.urljoin(url, '/current?format=json')
   connection = urllib2.urlopen(json_url)
   status = json.loads(connection.read())
   connection.close()
   return status['message']
 
 def CMDtree(parser, args):
   """show the status of the tree"""
   (options, args) = parser.parse_args(args)
   status = GetTreeStatus()
   if 'unset' == status:
@@ skipping 76 matching lines @@
             ('AppEngine is misbehaving and returned HTTP %d, again. Keep faith '
              'and retry or visit go/isgaeup.\n%s') % (e.code, str(e)))
 
   # Not a known command. Default to help.
   GenUsage(parser, 'help')
   return CMDhelp(parser, argv)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))