Make a global enum to differentiate impl & proxy.

ppapi/proxy/ppb_file_system_proxy.cc

 // 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.
 
 #include "ppapi/proxy/ppb_file_system_proxy.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_file_system.h"
@@ skipping 45 matching lines @@
  private:
   PP_FileSystemType type_;
   bool called_open_;
   scoped_refptr<TrackedCallback> current_open_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystem);
 };
 
 FileSystem::FileSystem(const HostResource& host_resource,
                        PP_FileSystemType type)
-    : Resource(host_resource),
+    : Resource(OBJECT_IS_PROXY, host_resource),
       type_(type),
       called_open_(false) {
 }
 
 FileSystem::~FileSystem() {
 }
 
 PPB_FileSystem_API* FileSystem::AsPPB_FileSystem_API() {
   return this;
 }
@@ skipping 99 matching lines @@
 
 void PPB_FileSystem_Proxy::OpenCompleteInHost(
     int32_t result,
     const HostResource& host_resource) {
   dispatcher()->Send(new PpapiMsg_PPBFileSystem_OpenComplete(
       API_ID_PPB_FILE_SYSTEM, host_resource, result));
 }
 
 }  // namespace proxy
 }  // namespace ppapi