Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtk2ui/menu_util.h

-// Copyright 2013 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 CHROME_BROWSER_UI_LIBGTK2UI_MENU_UTIL_H_
-#define CHROME_BROWSER_UI_LIBGTK2UI_MENU_UTIL_H_
-
-#include <gtk/gtk.h>
-
-#include "ui/gfx/image/image.h"
-
-namespace ui {
-class MenuModel;
-}
-
-namespace libgtk2ui {
-// Builds GtkImageMenuItems.
-GtkWidget* BuildMenuItemWithImage(const std::string& label, GtkWidget* image);
-GtkWidget* BuildMenuItemWithImage(const std::string& label,
-                                  const gfx::Image& icon);
-GtkWidget* BuildMenuItemWithLabel(const std::string& label);
-
-ui::MenuModel* ModelForMenuItem(GtkMenuItem* menu_item);
-
-// This method is used to build the menu dynamically. The return value is the
-// new menu item.
-GtkWidget* AppendMenuItemToMenu(int index,
-                                ui::MenuModel* model,
-                                GtkWidget* menu_item,
-                                GtkWidget* menu,
-                                bool connect_to_activate,
-                                GCallback item_activated_cb,
-                                void* this_ptr);
-
-// Gets the ID of a menu item.
-// Returns true if the menu item has an ID.
-bool GetMenuItemID(GtkWidget* menu_item, int* menu_id);
-
-// Execute command associated with specified id.
-void ExecuteCommand(ui::MenuModel* model, int id);
-
-// Creates a GtkMenu from |model_|. block_activation_ptr is used to disable
-// the item_activated_callback while we set up the set up the menu items.
-// See comments in definition of SetMenuItemInfo for more info.
-void BuildSubmenuFromModel(ui::MenuModel* model,
-                           GtkWidget* menu,
-                           GCallback item_activated_cb,
-                           bool* block_activation,
-                           void* this_ptr);
-
-// Sets the check mark, enabled/disabled state and dynamic labels on menu items.
-void SetMenuItemInfo(GtkWidget* widget, void* block_activation_ptr);
-
-}  // namespace libgtk2ui
-
-#endif  // CHROME_BROWSER_UI_LIBGTK2UI_MENU_UTIL_H_