Create a new depot_tools_testing_lib to move utility modules there

tests/gclient_utils_test.py

 #!/usr/bin/env python
 # Copyright (c) 2011 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 os
 import StringIO
 import sys
 
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
-from super_mox import SuperMoxTestBase
-import trial_dir
+from testing_support.super_mox import SuperMoxTestBase
+from testing_support import trial_dir
 
 import gclient_utils
 import subprocess2
 
 
 class GclientUtilBase(SuperMoxTestBase):
   def setUp(self):
     super(GclientUtilBase, self).setUp()
     gclient_utils.sys.stdout.flush = lambda: None
     self.mox.StubOutWithMock(subprocess2, 'Popen')
@@ skipping 145 matching lines @@
     os.chmod(l3, 0)
     os.chmod(l2, 0)
     os.chmod(l1, 0)
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()
 
 # vim: ts=2:sw=2:tw=80:et: