Clarify/fix fullscreen semantics, and add GetScreenSize

ppapi/proxy/ppb_fullscreen_proxy.h

 // Copyright (c) 2010 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_PPB_FULLSCREEN_PROXY_H_
 #define PPAPI_PPB_FULLSCREEN_PROXY_H_
 
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_bool.h"
+#include "ppapi/c/pp_size.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/interface_proxy.h"
 
 struct PPB_Fullscreen_Dev;
 
 namespace pp {
 namespace proxy {
 
 class PPB_Fullscreen_Proxy : public InterfaceProxy {
  public:
   PPB_Fullscreen_Proxy(Dispatcher* dispatcher, const void* target_interface);
   virtual ~PPB_Fullscreen_Proxy();
 
   static const Info* GetInfo();
 
   const PPB_Fullscreen_Dev* ppb_fullscreen_target() const {
     return reinterpret_cast<const PPB_Fullscreen_Dev*>(target_interface());
   }
 
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
  private:
   // Message handlers.
   void OnMsgIsFullscreen(PP_Instance instance,
                          PP_Bool* result);
   void OnMsgSetFullscreen(PP_Instance instance,
                           PP_Bool fullscreen,
                           PP_Bool* result);
+  void OnMsgGetScreenSize(PP_Instance instance,
+                          PP_Bool* result,
+                          PP_Size* size);
 };
 
 }  // namespace proxy
 }  // namespace pp
 
 #endif  // PPAPI_PPB_FULLSCREEN_PROXY_H_