Add license to checklicenses.py for protobuf

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 460 matching lines @@
         # thus we don't expect to pass license checks.
         'UNKNOWN',
     ],
     'third_party/molokocacao': [  # http://crbug.com/98453
         'UNKNOWN',
     ],
     'third_party/ocmock/OCMock': [  # http://crbug.com/98454
         'UNKNOWN',
     ],
     'third_party/protobuf': [  # http://crbug.com/98455
+        # third_party/protobuf/conformance/third_party/jsoncpp/jsoncpp.cpp
+        'MIT/X11 (BSD like) Public domain MIT/X11 (BSD like)',

[Lei Zhang, 2016/04/18 21:25:21]

Oh geez, because of the amalgamation in jsoncpp.cpp, this is licensecheck.pl
trying to say: "MIT, Public domain, MIT".

Please add a comment to reference https://crbug.com/604499

+
         'UNKNOWN',
     ],
 
     # https://bitbucket.org/ned/coveragepy/issue/313/add-license-file-containing-2-3-or-4
     # BSD 2-clause license.
     'third_party/pycoverage': [
         'UNKNOWN',
     ],
 
     'third_party/pyelftools': [ # http://crbug.com/222831
@@ skipping 294 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())