Adds code for a new Aura shell.

ui/aura_shell/launcher/launcher_button.h

+// Copyright (c) 2011 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 UI_AURA_SHELL_LAUNCHER_BUTTON_H_
+#define UI_AURA_SHELL_LAUNCHER_BUTTON_H_
+#pragma once
+
+#include "views/controls/button/image_button.h"
+
+class LauncherButton : public views::ImageButton {
+ public:
+  explicit LauncherButton(views::ButtonListener* listener);
+  virtual ~LauncherButton();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(LauncherButton);
+};
+
+#endif  // UI_AURA_SHELL_LAUNCHER_BUTTON_H_