Use macros to define pepper interfaces

ppapi/proxy/ppb_testing_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_TESTING_PROXY_H_
 #define PPAPI_PROXY_PPB_TESTING_PROXY_H_
 
 #include "base/basictypes.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/shared_impl/host_resource.h"
 
 struct PP_Point;
 struct PPB_Testing_Dev;
 
 namespace ppapi {
 namespace proxy {
 
 class PPB_Testing_Proxy : public InterfaceProxy {
  public:
-  PPB_Testing_Proxy(Dispatcher* dispatcher, const void* target_interface);
+  PPB_Testing_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_Testing_Proxy();
 
   static const Info* GetInfo();
 
-  const PPB_Testing_Dev* ppb_testing_target() const {
-    return static_cast<const PPB_Testing_Dev*>(target_interface());
-  }
-
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
  private:
   // Message handlers.
   void OnMsgReadImageData(const ppapi::HostResource& device_context_2d,
                           const ppapi::HostResource& image,
                           const PP_Point& top_left,
                           PP_Bool* result);
   void OnMsgRunMessageLoop(PP_Instance instance);
   void OnMsgQuitMessageLoop(PP_Instance instance);
   void OnMsgGetLiveObjectsForInstance(PP_Instance instance, uint32_t* result);
 
+  // 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_Testing_Dev* ppb_testing_impl_;
+
   DISALLOW_COPY_AND_ASSIGN(PPB_Testing_Proxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_TESTING_PROXY_H_