PPAPI: Add dev synchronous JS->Plugin messaging API

content/renderer/pepper/pepper_plugin_instance_impl.cc

Index: content/renderer/pepper/pepper_plugin_instance_impl.cc
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.cc b/content/renderer/pepper/pepper_plugin_instance_impl.cc
index c1bc651ca3a128eccc9af186294680e5c88f15f9..573831d4d55983252115a44c5c447c1ffc081ea5 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.cc
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.cc
@@ -1305,6 +1305,21 @@ void PepperPluginInstanceImpl::PostMessageToJavaScript(PP_Var message) {
   message_channel_->PostMessageToJavaScript(message);
 }
 
+int32_t PepperPluginInstanceImpl::RegisterMessageHandler(
+    PP_Instance instance,
+    void* user_data,
+    const PPP_MessageHandler_0_1* handler,
+    PP_Resource message_loop) {
+  // Not supported in-process.
+  NOTIMPLEMENTED();
+  return PP_ERROR_FAILED;
+}
+
+void PepperPluginInstanceImpl::UnregisterMessageHandler(PP_Instance instance) {
+  // Not supported in-process.
+  NOTIMPLEMENTED();
+}
+
 base::string16 PepperPluginInstanceImpl::GetSelectedText(bool html) {
   // Keep a reference on the stack. See NOTE above.
   scoped_refptr<PepperPluginInstanceImpl> ref(this);