athena: Add a minimized state for the home-card.

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 aura {
+class Window;
+}
+
+namespace views {
+class Widget;
+}
+
+namespace athena {
+
+class MinimizedHomeDragDelegate {
+ public:
+  virtual ~MinimizedHomeDragDelegate() {}
+
+  virtual void OnDragUpCompleted() = 0;
+};
+
+// Note that |delegate| is guaranteed to be alive as long as the returned widget
+// is alive.
+views::Widget* CreateMinimizedHome(aura::Window* container,
+                                   MinimizedHomeDragDelegate* delegate);
+
+}  // namespace athena
+
+#endif  // ATHENA_HOME_MINIMIZED_HOME_H_