Implement animation UI for opening/closing an app list folder.

ui/app_list/views/app_list_item_view.h

 // Copyright (c) 2012 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_APP_LIST_VIEWS_APP_LIST_ITEM_VIEW_H_
 #define UI_APP_LIST_VIEWS_APP_LIST_ITEM_VIEW_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 43 matching lines @@
   void SetAsAttemptedFolderTarget(bool is_target_folder);
 
   AppListItem* item() const { return item_; }
 
   const views::Label* title() const { return title_; }
 
   // In a synchronous drag the item view isn't informed directly of the drag
   // ending, so the runner of the drag should call this.
   void OnSyncDragEnd();
 
+  // Returns the icon bounds relative to AppListItemView.
+  const gfx::Rect& GetIconBounds() const;
+
  private:
   enum UIState {
     UI_STATE_NORMAL,    // Normal UI (icon + label)
     UI_STATE_DRAGGING,  // Dragging UI (scaled icon only)
     UI_STATE_DROPPING_IN_FOLDER,  // Folder dropping preview UI
   };
 
   // Get icon from |item_| and schedule background processing.
   void UpdateIcon();
 
@@ skipping 59 matching lines @@
 
   // A timer to defer showing drag UI when mouse is pressed.
   base::OneShotTimer<AppListItemView> mouse_drag_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListItemView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_APP_LIST_ITEM_VIEW_H_