Create a new depot_tools_testing_lib to move utility modules there

tests/breakpad_unittest.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.
 
 """Unit tests for breakpad.py."""
 
 import os
 import sys
 
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
-from super_mox import SuperMoxTestBase
+from testing_support.super_mox import SuperMoxTestBase
 
 import breakpad
 
 
 class Breakpad(SuperMoxTestBase):
   """Setups and tear downs the mocks but doesn't test anything as-is."""
   def setUp(self):
     super(Breakpad, self).setUp()
     self.mox.StubOutWithMock(breakpad.atexit, 'register')
     self.mox.StubOutWithMock(breakpad.getpass, 'getuser')
@@ skipping 87 matching lines @@
   def testSendException(self):
     obj = Exception('foo')
     obj.msg = 'a message'
     self._check(obj, 'foo\nMsg: a message')
 
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()