Added function to get native path case on Windows and OSX.

tools/isolate/isolate_test.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.
 
 import json
+import logging
 import os
+import sys
 import tempfile
 import unittest
 
 import isolate
 
 ROOT_DIR = os.path.dirname(os.path.abspath(__file__))
 
 
 class Isolate(unittest.TestCase):
   def setUp(self):
@@ skipping 64 matching lines @@
       u'foo': u'bar',
       u'variables': {
         'expected': 'very',
         u'unexpected': u'seriously',
       },
     }
     self._run_process_options(values, {'expected': 'very'}, expected_data)
 
 
 if __name__ == '__main__':
+  logging.basicConfig(
+      level=logging.DEBUG if '-v' in sys.argv else logging.ERROR,
+      format='%(levelname)5s %(filename)15s(%(lineno)3d): %(message)s')
   unittest.main()