Refactor nag functionality in to NagTimer class.

tests/subprocess2_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.
 
 """Unit tests for subprocess2.py."""
 
 import logging
 import optparse
 import os
@@ skipping 60 matching lines @@
     """Mocks the whole subprocess2.Popen class."""
     results = {}
     class fake_Popen(object):
       returncode = -8
       def __init__(self, args, **kwargs):
         assert not results
         results.update(kwargs)
         results['args'] = args
       @staticmethod
       # pylint: disable=W0622
-      def communicate(input=None, timeout=None, nag_timer=None):
+      def communicate(input=None, timeout=None, nag_max=None, nag_timer=None):
         return None, None
     self.mock(subprocess2, 'Popen', fake_Popen)
     return results
 
   def _fake_subprocess_Popen(self):
     """Mocks the base class subprocess.Popen only."""
     results = {}
     def __init__(self, args, **kwargs):
       assert not results
       results.update(kwargs)
@@ skipping 579 matching lines @@
   return options.return_value
 
 
 if __name__ == '__main__':
   logging.basicConfig(level=
       [logging.WARNING, logging.INFO, logging.DEBUG][
         min(2, sys.argv.count('-v'))])
   if len(sys.argv) > 1 and sys.argv[1] == '--child':
     sys.exit(child_main(sys.argv[2:]))
   unittest.main()