Created a stock implementation of the MessageLoopProxy interface than can be ...

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,
     },
     'target_conditions': [
@@ skipping 100 matching lines @@
           'logging_win.cc',
           'mac_util.h',
           'mac_util.mm',
           'mach_ipc_mac.h',
           'mach_ipc_mac.mm',
           'memory_debug.cc',
           'memory_debug.h',
           'message_loop.cc',
           'message_loop.h',
           'message_loop_proxy.h',
+          'message_loop_proxy_impl.cc',
+          'message_loop_proxy_impl.h',
           'message_pump.h',
           'message_pump_default.cc',
           'message_pump_default.h',
           'message_pump_win.cc',
           'message_pump_win.h',
           'mime_util.h',
           'mime_util_xdg.cc',
           'move.h',
           'native_library.h',
           'native_library_linux.cc',
@@ skipping 522 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',
           ],
         },
       ],
     }],
   ],
 }