Add a gRPC repository to DEPS to fetch for Linux platform.

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 369 matching lines @@
     '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',
     ],
+    'third_party/grpc': [ # https://github.com/grpc/grpc/issues/6951
+        'UNKNOWN',
+    ],
     'third_party/hunspell': [  # http://crbug.com/98134
         'UNKNOWN',
     ],
     'third_party/iccjpeg': [  # http://crbug.com/98137
         'UNKNOWN',
     ],
     'third_party/icu': [  # http://crbug.com/98301
         'UNKNOWN',
     ],
     'third_party/jmake': [  # Used only at build time.
@@ skipping 380 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())