Refactor the home card structure and introduce animation.

athena/home/minimized_home.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 ATHENA_HOME_MINIMIZED_HOME_H_
 #define ATHENA_HOME_MINIMIZED_HOME_H_
 
-namespace views {
-class View;
+#include "base/memory/scoped_ptr.h"
+
+namespace ui {
+class LayerOwner;
 }
 
 namespace athena {
 
-views::View* CreateMinimizedHome();
+scoped_ptr<ui::LayerOwner> CreateMinimizedHome();
 
 }  // namespace athena
 
 #endif  // ATHENA_HOME_MINIMIZED_HOME_H_