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

tools/isolate/trace_inputs_smoke_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 cStringIO
 import logging
 import os
 import shutil
 import subprocess
@@ skipping 14 matching lines @@
     self.cwd = cwd
 
   def __str__(self):
     return super(CalledProcessError, self).__str__() + (
         '\n'
         'cwd=%s\n%s') % (self.cwd, self.output)
 
 
 class TraceInputs(unittest.TestCase):
   def setUp(self):
-    self.tempdir = tempfile.mkdtemp()
+    self.tempdir = tempfile.mkdtemp(prefix='trace_smoke_test')
     self.log = os.path.join(self.tempdir, 'log')
     os.chdir(ROOT_DIR)
 
   def tearDown(self):
-    shutil.rmtree(self.tempdir)
+    if VERBOSE:
+      print 'Leaking: %s' % self.tempdir
+    else:
+      shutil.rmtree(self.tempdir)
 
   def _execute(self, is_gyp):
     cmd = [
       sys.executable, os.path.join('..', '..', 'trace_inputs.py'),
       '--log', self.log,
       '--root-dir', ROOT_DIR,
     ]
     if is_gyp:
       cmd.extend(
           [
@@ skipping 67 matching lines @@
     trace_inputs.pretty_print(expected_value, expected_buffer)
 
     actual = self._execute(True)
     self.assertEquals(expected_buffer.getvalue(), actual)
 
 
 if __name__ == '__main__':
   VERBOSE = '-v' in sys.argv
   logging.basicConfig(level=logging.DEBUG if VERBOSE else logging.ERROR)
   unittest.main()