Add InputApi.version so the presubmit script can mark a minimum supported version for instance.

tests/presubmit_unittest.py

 #!/usr/bin/python
 # Copyright (c) 2006-2009 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."""
 
 import os
 import StringIO
 import sys
@@ skipping 386 matching lines @@
 
 class InputApiUnittest(PresubmitTestsBase):
   """Tests presubmit.InputApi."""
   def testMembersChanged(self):
     members = [
       'AbsoluteLocalPaths', 'AffectedFiles', 'AffectedTextFiles',
       'DepotToLocalPath', 'FilterTextFiles', 'LocalPaths', 'LocalToDepotPath',
       'PresubmitLocalPath', 'RightHandSideLines', 'ServerPaths',
       'basename', 'cPickle', 'cStringIO', 'canned_checks', 'change',
       'marshal', 'os_path', 'pickle', 'platform',
-      're', 'subprocess', 'tempfile', 'urllib2',
+      're', 'subprocess', 'tempfile', 'urllib2', 'version',
     ]
     # If this test fails, you should add the relevant test.
     self.compareMembers(presubmit.InputApi(None, './.'), members)
 
   def testDepotToLocalPath(self):
     path = presubmit.InputApi.DepotToLocalPath('svn:/foo/smurf')
     self.failUnless(path == 'smurf')
     path = presubmit.InputApi.DepotToLocalPath('svn:/foo/notfound/burp')
     self.failUnless(path == None)
 
@@ skipping 326 matching lines @@
     # TODO(maruel): Add real tests.
     self.failIf(presubmit_canned_checks.RunPythonUnitTests(
         self.MockInputApi(),
         presubmit.OutputApi, []))
     self.failUnless(presubmit_canned_checks.RunPythonUnitTests(
         self.MockInputApi(),
         presubmit.OutputApi, ['non_existent_module']))
 
 if __name__ == '__main__':
   unittest.main()