Re-land "Check in a simple pure-python based Markdown previewer."

tools/checklicenses/checklicenses.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.
 
 """Makes sure that all files contain proper licensing information."""
 
 
 import json
 import optparse
@@ skipping 133 matching lines @@
         'BSL (v1.0) GPL',
         'BSL (v1.0) GPL (v3.1)',
         'GPL',
         'GPL (unversioned/unknown version)',
         'GPL (v2)',
         'GPL (v2 or later)',
         'GPL (v3.1)',
         'GPL (v3 or later)',
         'MPL (v1.1) LGPL (unversioned/unknown version)',
     ],
+
+    # The project is BSD-licensed but the individual files do not have
+    # consistent license headers. Also, this is just used in a utility
+    # and not shipped. https://github.com/waylan/Python-Markdown/issues/435
+    'third_party/Python-Markdown': [
+        'UNKNOWN',
+    ],
+
     'third_party/WebKit': [
         'UNKNOWN',
     ],
 
     # http://code.google.com/p/angleproject/issues/detail?id=217
     'third_party/angle': [
         'UNKNOWN',
     ],
 
     # http://crbug.com/222828
@@ skipping 524 matching lines @@
                            action='store_true',
                            default=False,
                            help='Ignore path-specific license whitelist.')
   option_parser.add_option('--json', help='Path to JSON output file')
   options, args = option_parser.parse_args()
   return check_licenses(options, args)
 
 
 if '__main__' == __name__:
   sys.exit(main())