Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtk2ui/app_indicator_icon_menu.h

-// Copyright 2014 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_APP_INDICATOR_ICON_MENU_H_
-#define CHROME_BROWSER_UI_LIBGTK2UI_APP_INDICATOR_ICON_MENU_H_
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "chrome/browser/ui/libgtk2ui/gtk2_signal.h"
-
-typedef struct _GtkMenu GtkMenu;
-typedef struct _GtkWidget GtkWidget;
-
-namespace ui {
-class MenuModel;
-}
-
-namespace libgtk2ui {
-
-// The app indicator icon's menu.
-class AppIndicatorIconMenu {
- public:
-  explicit AppIndicatorIconMenu(ui::MenuModel* model);
-  virtual ~AppIndicatorIconMenu();
-
-  // Sets a menu item at the top of |gtk_menu_| as a replacement for the app
-  // indicator icon's click action. |callback| is called when the menu item
-  // is activated.
-  void UpdateClickActionReplacementMenuItem(const char* label,
-                                            const base::Closure& callback);
-
-  // Refreshes all the menu item labels and menu item checked/enabled states.
-  void Refresh();
-
-  GtkMenu* GetGtkMenu();
-
- private:
-  // Callback for when the "click action replacement" menu item is activated.
-  CHROMEGTK_CALLBACK_0(AppIndicatorIconMenu,
-                       void,
-                       OnClickActionReplacementMenuItemActivated);
-
-  // Callback for when a menu item is activated.
-  CHROMEGTK_CALLBACK_0(AppIndicatorIconMenu, void, OnMenuItemActivated);
-
-  // Not owned.
-  ui::MenuModel* menu_model_;
-
-  // Whether a "click action replacement" menu item has been added to the menu.
-  bool click_action_replacement_menu_item_added_;
-
-  // Called when the click action replacement menu item is activated. When a
-  // menu item from |menu_model_| is activated, MenuModel::ActivatedAt() is
-  // invoked and is assumed to do any necessary processing.
-  base::Closure click_action_replacement_callback_;
-
-  GtkWidget* gtk_menu_;
-
-  bool block_activation_;
-
-  DISALLOW_COPY_AND_ASSIGN(AppIndicatorIconMenu);
-};
-
-}  // namespace libgtk2ui
-
-#endif  // CHROME_BROWSER_UI_LIBGTK2UI_APP_INDICATOR_ICON_MENU_H_