This patch tries to remove most of the manual registration for Pepper interfaces, and replaces it...

ppapi/proxy/ppp_instance_private_proxy.h

Index: ppapi/proxy/ppp_instance_private_proxy.h
===================================================================
--- ppapi/proxy/ppp_instance_private_proxy.h	(revision 100758)
+++ ppapi/proxy/ppp_instance_private_proxy.h	(working copy)
@@ -20,16 +20,11 @@
 
 class PPP_Instance_Private_Proxy : public InterfaceProxy {
  public:
-  PPP_Instance_Private_Proxy(Dispatcher* dispatcher,
-                             const void* target_interface);
+  PPP_Instance_Private_Proxy(Dispatcher* dispatcher);
   virtual ~PPP_Instance_Private_Proxy();
 
   static const Info* GetInfo();
 
-  const PPP_Instance_Private* ppp_instance_private_target() const {
-    return reinterpret_cast<const PPP_Instance_Private*>(target_interface());
-  }
-
  private:
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
@@ -37,6 +32,13 @@
   // Message handlers.
   void OnMsgGetInstanceObject(PP_Instance instance,
                               SerializedVarReturnValue result);
+
+  // When this proxy is in the plugin side, this value caches the interface
+  // pointer so we don't have to retrieve it from the dispatcher each time.
+  // In the host, this value is always NULL.
+  const PPP_Instance_Private* ppp_instance_private_impl_;
+
+  DISALLOW_COPY_AND_ASSIGN(PPP_Instance_Private_Proxy);
 };
 
 }  // namespace proxy