Added os to input_api

tests/presubmit_unittest.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.
 
 """Unit tests for presubmit_support.py and presubmit_canned_checks.py."""
 
 # pylint: disable=E1101,E1103
 
 import functools
@@ skipping 1171 matching lines @@
     self.mox.ReplayAll()
     members = [
       'AbsoluteLocalPaths', 'AffectedFiles', 'AffectedSourceFiles',
       'AffectedTextFiles',
       'DEFAULT_BLACK_LIST', 'DEFAULT_WHITE_LIST',
       'DepotToLocalPath', 'FilterSourceFile', 'LocalPaths',
       'LocalToDepotPath', 'Command', 'RunTests',
       'PresubmitLocalPath', 'ReadFile', 'RightHandSideLines', 'ServerPaths',
       'basename', 'cPickle', 'cpplint', 'cStringIO', 'canned_checks', 'change',
       'environ', 'glob', 'host_url', 'is_committing', 'json', 'logging',
-      'marshal', 'os_listdir', 'os_walk', 'os_path', 'owners_db', 'pickle',
-      'platform', 'python_executable', 're', 'rietveld', 'subprocess', 'tbr',
-      'tempfile', 'time', 'traceback', 'unittest', 'urllib2', 'version',
+      'marshal', 'os_listdir', 'os_walk', 'os_path', 'os_stat', 'owners_db',
+      'pickle', 'platform', 'python_executable', 're', 'rietveld', 'subprocess',
+      'tbr', 'tempfile', 'time', 'traceback', 'unittest', 'urllib2', 'version',
       'verbose',
     ]
     # If this test fails, you should add the relevant test.
     self.compareMembers(
         presubmit.InputApi(self.fake_change, './.', False, None, False),
         members)
 
   def testDepotToLocalPath(self):
     presubmit.scm.SVN._CaptureInfo(['svn://foo/smurf'], self.fake_root_dir
         ).AndReturn({'Path': 'prout'})
@@ skipping 1714 matching lines @@
         owners_check=False)
     self.assertEqual(1, len(results))
     self.assertEqual(
         'Found line ending with white spaces in:', results[0]._message)
     self.checkstdout('')
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()