PPAPI: Add dev synchronous JS->Plugin messaging API

mojo/examples/pepper_container_app/plugin_instance.cc

Index: mojo/examples/pepper_container_app/plugin_instance.cc
diff --git a/mojo/examples/pepper_container_app/plugin_instance.cc b/mojo/examples/pepper_container_app/plugin_instance.cc
index d4b79625afa59592d76a3115c791ed7f4247f99e..ba828a2dd1b31d970311cee259281d92ab5660e9 100644
--- a/mojo/examples/pepper_container_app/plugin_instance.cc
+++ b/mojo/examples/pepper_container_app/plugin_instance.cc
@@ -226,6 +226,19 @@ void PluginInstance::PostMessage(PP_Instance instance, PP_Var message) {
   NOTIMPLEMENTED();
 }
 
+int32_t PluginInstance::RegisterMessageHandler(
+    PP_Instance instance,
+    void* user_data,
+    const PPP_MessageHandler_0_1* handler,
+    PP_Resource message_loop) {
+  NOTIMPLEMENTED();
+  return PP_ERROR_FAILED;
+}
+
+void PluginInstance::UnregisterMessageHandler(PP_Instance instance) {
+  NOTIMPLEMENTED();
+}
+
 PP_Bool PluginInstance::SetCursor(PP_Instance instance,
                                   PP_MouseCursor_Type type,
                                   PP_Resource image,