Add dummy implementations for TrayIcon.

atom/browser/ui/tray_icon.h

@@ -0,0 +1,45 @@
+// 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_TRAY_ICON_H_
+#define ATOM_BROWSER_UI_TRAY_ICON_H_
+
+#include <string>
+
+#include "ui/base/models/simple_menu_model.h"
+
+namespace atom {
+
+class TrayIcon {
+ public:
+  static TrayIcon* Create();
+
+  // Sets the image associated with this status icon.
+  virtual void SetImage(const gfx::ImageSkia& image) = 0;
+
+  // Sets the image associated with this status icon when pressed.
+  virtual void SetPressedImage(const gfx::ImageSkia& image) = 0;
+
+  // Sets the hover text for this status icon. This is also used as the label
+  // for the menu item which is created as a replacement for the status icon
+  // click action on platforms that do not support custom click actions for the
+  // status icon (e.g. Ubuntu Unity).
+  virtual void SetToolTip(const std::string& tool_tip) = 0;
+
+  // Set the context menu for this icon.
+  void SetContextMenu(ui::SimpleMenuModel* menu_model);
+
+ protected:
+  TrayIcon();
+  virtual ~TrayIcon();
+
+ private:
+  ui::SimpleMenuModel* model_;  // Weak reference.
+
+  DISALLOW_COPY_AND_ASSIGN(TrayIcon);
+};
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_UI_TRAY_ICON_H_