PPAPI: Add dev synchronous JS->Plugin messaging API

ppapi/proxy/ppb_instance_proxy.h

 // 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.
 
 #ifndef PPAPI_PROXY_PPB_INSTANCE_PROXY_H_
 #define PPAPI_PROXY_PPB_INSTANCE_PROXY_H_
 
 #include <string>
 
 #include "ppapi/c/pp_instance.h"
@@ skipping 68 matching lines @@
   virtual int32_t RequestFilteringInputEvents(PP_Instance instance,
                                               uint32_t event_classes) OVERRIDE;
   virtual void StartTrackingLatency(PP_Instance instance) OVERRIDE;
   virtual void ClearInputEventRequest(PP_Instance instance,
                                       uint32_t event_classes) OVERRIDE;
   virtual void ZoomChanged(PP_Instance instance, double factor) OVERRIDE;
   virtual void ZoomLimitsChanged(PP_Instance instance,
                                  double minimum_factor,
                                  double maximium_factor) OVERRIDE;
   virtual void PostMessage(PP_Instance instance, PP_Var message) OVERRIDE;
+  virtual int32_t RegisterMessageHandler(PP_Instance instance,
+                                         void* user_data,
+                                         const PPP_MessageHandler_0_1* handler,
+                                         PP_Resource message_loop) OVERRIDE;
+  virtual void UnregisterMessageHandler(PP_Instance instance) OVERRIDE;
   virtual PP_Bool SetCursor(PP_Instance instance,
                             PP_MouseCursor_Type type,
                             PP_Resource image,
                             const PP_Point* hot_spot) OVERRIDE;
   virtual int32_t LockMouse(PP_Instance instance,
                             scoped_refptr<TrackedCallback> callback) OVERRIDE;
   virtual void UnlockMouse(PP_Instance instance) OVERRIDE;
   virtual void SetTextInputType(PP_Instance instance,
                                 PP_TextInput_Type type) OVERRIDE;
   virtual void UpdateCaretPosition(PP_Instance instance,
@@ skipping 182 matching lines @@
   // Other helpers.
   void CancelAnyPendingRequestSurroundingText(PP_Instance instance);
 
   ProxyCompletionCallbackFactory<PPB_Instance_Proxy> callback_factory_;
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_INSTANCE_PROXY_H_