Add CrOS's dbus-c++ to Chromium Linux. This is needed to build mtpd.

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 optparse
 import os.path
@@ skipping 172 matching lines @@
 
     'third_party/bsdiff/mbsdiff.cc': [
         'UNKNOWN',
     ],
     'third_party/bzip2': [
         'UNKNOWN',
     ],
     'third_party/cld/encodings/compact_lang_det': [  # http://crbug.com/98120
         'UNKNOWN',
     ],
+    # Not used. http://crbug.com/156020
+    # Using third_party/cros_dbus_cplusplus/cros_dbus_cplusplus.gyp instead.
+    'third_party/cros_dbus_cplusplus/source/autogen.sh': [
+        'UNKNOWN',
+    ],
+    # Included in the source tree but not built. http://crbug.com/156020
+    'third_party/cros_dbus_cplusplus/source/examples': [
+        'UNKNOWN',
+    ],
     'third_party/devscripts': [
         'GPL (v2 or later)',
     ],
     'third_party/expat/files/lib': [  # http://crbug.com/98121
         'UNKNOWN',
     ],
     'third_party/ffmpeg': [
         'GPL',
         'GPL (v2)',
         'GPL (v2 or later)',
@@ skipping 308 matching lines @@
   option_parser.add_option('--ignore-suppressions',
                            action='store_true',
                            default=False,
                            help='Ignore path-specific license whitelist.')
   options, args = option_parser.parse_args()
   return check_licenses(options, args)
 
 
 if '__main__' == __name__:
   sys.exit(main())