gtk: Add dummy implementation of Menu.

browser/api/atom_api_menu_gtk.cc

@@ -0,0 +1,32 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "browser/api/atom_api_menu_gtk.h"
+
+namespace atom {
+
+namespace api {
+
+MenuGtk::MenuGtk(v8::Handle<v8::Object> wrapper)
+    : Menu(wrapper) {
+}
+
+MenuGtk::~MenuGtk() {
+}
+
+void MenuGtk::Popup(NativeWindow* native_window) {
+}
+
+// static
+void Menu::AttachToWindow(const v8::FunctionCallbackInfo<v8::Value>& args) {
+}
+
+// static
+Menu* Menu::Create(v8::Handle<v8::Object> wrapper) {
+  return new MenuGtk(wrapper);
+}
+
+}  // namespace api
+
+}  // namespace atom