Add dummy implementations for TrayIcon.

atom/browser/ui/tray_icon_win.h

@@ -0,0 +1,29 @@
+// 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_WIN_H_
+#define ATOM_BROWSER_UI_TRAY_ICON_WIN_H_
+
+#include <string>
+
+#include "atom/browser/ui/tray_icon.h"
+
+namespace atom {
+
+class TrayIconWin : public TrayIcon {
+ public:
+  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;
+
+ private:
+  TrayIconWin();
+  virtual ~TrayIconWin();
+
+  DISALLOW_COPY_AND_ASSIGN(TrayIconWin);
+};
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_UI_TRAY_ICON_WIN_H_