gtk: Add TrayIcon implementation for GtkStatusIcon.

atom/browser/ui/gtk/status_icon.h

@@ -0,0 +1,44 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_UI_GTK_STATUS_ICON_H_
+#define ATOM_BROWSER_UI_GTK_STATUS_ICON_H_
+
+#include <string>
+
+#include <gtk/gtk.h>
+
+#include "atom/browser/ui/tray_icon.h"
+#include "ui/base/gtk/gtk_signal.h"
+
+class MenuGtk;
+
+namespace atom {
+
+class StatusIcon : public TrayIcon {
+ public:
+  StatusIcon();
+  virtual ~StatusIcon();
+
+  virtual void SetImage(const gfx::ImageSkia& image) OVERRIDE;
+  virtual void SetPressedImage(const gfx::ImageSkia& image) OVERRIDE;
+  virtual void SetToolTip(const std::string& tool_tip) OVERRIDE;
+  virtual void SetContextMenu(ui::SimpleMenuModel* menu_model) OVERRIDE;
+
+ private:
+  // Callback invoked when user right-clicks on the status icon.
+  CHROMEGTK_CALLBACK_2(StatusIcon, void, OnPopupMenu, guint, guint);
+
+  // The currently-displayed icon for the window.
+  GtkStatusIcon* icon_;
+
+  // The context menu for this icon (if any).
+  scoped_ptr<MenuGtk> menu_;
+
+  DISALLOW_COPY_AND_ASSIGN(StatusIcon);
+};
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_UI_GTK_STATUS_ICON_H_