PPAPI: Add dev synchronous JS->Plugin messaging API

ppapi/proxy/ppb_instance_proxy.cc

 // 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.
 
 #include "ppapi/proxy/ppb_instance_proxy.h"
 
 #include "base/memory/ref_counted.h"
 #include "build/build_config.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/pp_time.h"
@@ skipping 722 matching lines @@
 }
 #endif  // !defined(OS_NACL)
 
 void PPB_Instance_Proxy::PostMessage(PP_Instance instance,
                                      PP_Var message) {
   dispatcher()->Send(new PpapiHostMsg_PPBInstance_PostMessage(
       API_ID_PPB_INSTANCE,
       instance, SerializedVarSendInputShmem(dispatcher(), message,
                                             instance)));
 }
+int32_t PPB_Instance_Proxy::RegisterMessageHandler(
+    PP_Instance instance,
+    void* user_data,
+    const PPP_MessageHandler_0_1* handler,
+    PP_Resource message_loop) {
+  // Not yet implemented. See crbug.com/367896
+  return PP_ERROR_NOTSUPPORTED;
+}
+
+void PPB_Instance_Proxy::UnregisterMessageHandler(PP_Instance instance) {
+  // Not yet implemented. See crbug.com/367896
+}
 
 PP_Bool PPB_Instance_Proxy::SetCursor(PP_Instance instance,
                                       PP_MouseCursor_Type type,
                                       PP_Resource image,
                                       const PP_Point* hot_spot) {
   // Some of these parameters are important for security. This check is in the
   // plugin process just for the convenience of the caller (since we don't
   // bother returning errors from the other process with a sync message). The
   // parameters will be validated again in the renderer.
   if (!ValidateSetCursorParams(type, image, hot_spot))
@@ skipping 596 matching lines @@
     PP_Instance instance) {
   InstanceData* data = static_cast<PluginDispatcher*>(dispatcher())->
       GetInstanceData(instance);
   if (!data)
     return;  // Instance was probably deleted.
   data->should_do_request_surrounding_text = false;
 }
 
 }  // namespace proxy
 }  // namespace ppapi