Reland: Fall back to X11 system tray icons if libappindicator is not available.

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 "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_