Add libc++ and libc++abi to third-party.

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 197 matching lines @@
         'Perl',  # Build-only.
         # License missing upstream on 3 minor files.
         'UNKNOWN',  # https://rt.cpan.org/Public/Bug/Display.html?id=85915
     ],
     'third_party/lcov': [  # http://crbug.com/98304
         'UNKNOWN',
     ],
     'third_party/lcov/contrib/galaxy/genflat.pl': [
         'GPL (v2 or later)',
     ],
+    'third_party/libc++/trunk/include/support/solaris': [
+        # http://llvm.org/bugs/show_bug.cgi?id=18291
+        'UNKNOWN',
+    ],
+    'third_party/libc++/trunk/src/support/solaris/xlocale.c': [
+        # http://llvm.org/bugs/show_bug.cgi?id=18291
+        'UNKNOWN',
+    ],
+    'third_party/libc++/trunk/test': [
+        # http://llvm.org/bugs/show_bug.cgi?id=18291
+        'UNKNOWN',
+    ],
     'third_party/libevent': [  # http://crbug.com/98309
         'UNKNOWN',
     ],
     'third_party/libjingle/source/talk': [  # http://crbug.com/98310
         'UNKNOWN',
     ],
     'third_party/libjpeg': [  # http://crbug.com/98313
         'UNKNOWN',
     ],
     'third_party/libjpeg_turbo': [  # http://crbug.com/98314
@@ skipping 271 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())