base: add a thread-safety assertion checker

base/base.gypi

 # Copyright (c) 2010 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
       'base_extra_target': 0,
     },
@@ skipping 444 matching lines @@
           'nss_util.h',
           'setproctitle_linux.c',
           'setproctitle_linux.h',
           'sha2.cc',
           'sha2.h',
           'string16.cc',
           'string16.h',
           'sync_socket.h',
           'sync_socket_win.cc',
           'sync_socket_posix.cc',
+          'thread_restrictions.h',
+          'thread_restrictions.cc',
           'time_mac.cc',
           'time_posix.cc',
           'version.cc',
           'version.h',
         ],
         'conditions': [
           [ 'OS == "linux" or OS == "freebsd" or OS == "openbsd" or OS == "solaris"', {
             'conditions': [
               [ 'chromeos==1', {
                   'sources/': [ ['include', '_chromeos\\.cc$'] ]
@@ skipping 271 matching lines @@
             'third_party/xdg_mime/xdgmimemagic.c',
             'third_party/xdg_mime/xdgmimemagic.h',
             'third_party/xdg_mime/xdgmimeparent.c',
             'third_party/xdg_mime/xdgmimeparent.h',
           ],
         },
       ],
     }],
   ],
 }