Added a ResourceMessageFilter for handling resource messages on another thread.

ppapi/ppapi_host.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.
 
 {
    'targets': [
     {
       'target_name': 'ppapi_host',
       'type': '<(component)',
       'dependencies': [
@@ skipping 14 matching lines @@
         'host/host_factory.h',
         'host/host_message_context.cc',
         'host/host_message_context.h',
         'host/instance_message_filter.cc',
         'host/instance_message_filter.h',
         'host/ppapi_host.cc',
         'host/ppapi_host.h',
         'host/ppapi_host_export.h',
         'host/resource_host.cc',
         'host/resource_host.h',
+        'host/resource_message_filter.cc',
+        'host/resource_message_filter.h',
+        'host/resource_message_handler.cc',
+        'host/resource_message_handler.h',
       ],
     },
   ],
 }