Use macros to define pepper interfaces

ppapi/proxy/ppb_flash_clipboard_proxy.h

 // Copyright (c) 2011 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.
 
 #ifndef PPAPI_PROXY_PPB_FLASH_CLIPBOARD_PROXY_H_
 #define PPAPI_PROXY_PPB_FLASH_CLIPBOARD_PROXY_H_
 
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/interface_proxy.h"
 
 struct PPB_Flash_Clipboard;
 
 namespace ppapi {
 namespace proxy {
 
 class SerializedVarReceiveInput;
 class SerializedVarReturnValue;
 
 class PPB_Flash_Clipboard_Proxy : public InterfaceProxy {
  public:
-  PPB_Flash_Clipboard_Proxy(Dispatcher* dispatcher,
-                            const void* target_interface);
+  PPB_Flash_Clipboard_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_Flash_Clipboard_Proxy();
 
   static const Info* GetInfo();
 
-  const PPB_Flash_Clipboard* ppb_flash_clipboard_target() const {
-    return reinterpret_cast<const PPB_Flash_Clipboard*>(target_interface());
-  }
-
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
  private:
   // Message handlers.
   void OnMsgIsFormatAvailable(PP_Instance instance_id,
                               int clipboard_type,
                               int format,
                               bool* result);
   void OnMsgReadPlainText(PP_Instance instance_id,
                           int clipboard_type,
                           SerializedVarReturnValue result);
   void OnMsgWritePlainText(PP_Instance instance_id,
                            int clipboard_type,
                            SerializedVarReceiveInput text);
+
+  // When this proxy is in the host side, this value caches the interface
+  // pointer so we don't have to retrieve it from the dispatcher each time.
+  // In the plugin, this value is always NULL.
+  const PPB_Flash_Clipboard* ppb_flash_clipboard_impl_;
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_FLASH_CLIPBOARD_PROXY_H_