Factor out PathDifference into gclient_utils for a later reuse.

tests/gclient_utils_test.py

 #!/usr/bin/python
 # Copyright (c) 2006-2009 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 re
 import StringIO
 
 import gclient_utils
 from super_mox import SuperMoxTestBase
 
 
 class GclientUtilsUnittest(SuperMoxTestBase):
   """General gclient_utils.py tests."""
   def testMembersChanged(self):
     members = [
         'CheckCall', 'CheckCallError', 'Error', 'FileRead', 'FileWrite',
         'FindGclientRoot',
         'FullUrlFromRelative', 'FullUrlFromRelative2', 'GetNamedNodeText',
-        'GetNodeNamedAttributeText', 'IsUsingGit', 'ParseXML',
-        'PrintableObject', 'RemoveDirectory', 'SplitUrlRevision',
+        'GetNodeNamedAttributeText', 'IsUsingGit', 'PathDifference',
+        'ParseXML', 'PrintableObject', 'RemoveDirectory', 'SplitUrlRevision',
         'SubprocessCall', 'SubprocessCallAndFilter', 'errno', 'os', 're',
         'stat', 'subprocess', 'sys', 'time', 'xml',
     ]
     # If this test fails, you should add the relevant test.
     self.compareMembers(gclient_utils, members)
 
 
 class CheckCallTestCase(SuperMoxTestBase):
   def testCheckCallSuccess(self):
     command = ['boo', 'foo', 'bar']
@@ skipping 116 matching lines @@
     base_url = 'svn://a/b/c/d'
     full_url = gclient_utils.FullUrlFromRelative2(base_url, '/crap')
     self.assertEqual(full_url, 'svn://a/b/c/crap')
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()
 
 # vim: ts=2:sw=2:tw=80:et: