Support using TrackedCallbacks as hints to determine the handling thread of resource reply messages

ppapi/ppapi_proxy.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'ppapi_proxy_target': 0,
     },
     'target_conditions': [
@@ skipping 160 matching lines @@
           'proxy/proxy_array_output.h',
           'proxy/proxy_channel.cc',
           'proxy/proxy_channel.h',
           'proxy/proxy_completion_callback_factory.h',
           'proxy/proxy_module.cc',
           'proxy/proxy_module.h',
           'proxy/proxy_object_var.cc',
           'proxy/proxy_object_var.h',
           'proxy/resource_creation_proxy.cc',
           'proxy/resource_creation_proxy.h',
+          'proxy/resource_reply_thread_registrar.cc',
+          'proxy/resource_reply_thread_registrar.h',
           'proxy/talk_resource.cc',
           'proxy/talk_resource.h',
           'proxy/tcp_server_socket_private_resource.cc',
           'proxy/tcp_server_socket_private_resource.h',
           'proxy/tcp_socket_private_resource.cc',
           'proxy/tcp_socket_private_resource.h',
           'proxy/tcp_socket_resource.cc',
           'proxy/tcp_socket_resource.h',
           'proxy/tcp_socket_resource_base.cc',
           'proxy/tcp_socket_resource_base.h',
@@ skipping 62 matching lines @@
               'proxy/serialized_flash_menu.cc',
               'proxy/talk_resource.cc',
               'proxy/video_capture_resource.cc',
             ],
           }],
         ],
       }],
     ],
   },
 }