Add a dependency for FlatBuffers.

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 328 matching lines @@
     'third_party/expat/files/lib': [  # http://crbug.com/98121
         'UNKNOWN',
     ],
     'third_party/ffmpeg': [
         'GPL',
         'GPL (v2)',
         'GPL (v2 or later)',
         'GPL (v3 or later)',
         'UNKNOWN',  # http://crbug.com/98123
     ],
+    # Flatbuffers is known to be licenced under an Apache (v2.0) license.

[Paweł Hajdan Jr., 2016/05/06 10:22:02]

Do the files have license headers or do we just fail to recognize them?

In the former case, please file an upstream bug to get them added and link to it
here.

+    'third_party/flatbuffers': [
+        'UNKNOWN',
+    ],
     'third_party/fontconfig': [
         # https://bugs.freedesktop.org/show_bug.cgi?id=73401
         'UNKNOWN',
     ],
     'third_party/freetype2': [ # http://crbug.com/177319
         'UNKNOWN',
     ],
     'third_party/freetype-android': [ # http://crbug.com/177319
         'UNKNOWN',
     ],
@@ skipping 396 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())