[WebUI] ClosureCompile cr.ui.DragWrapper, create a real handler class

chrome/browser/resources/ntp4/trash.js

 // 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.
 
 /**
  * @fileoverview Trash
  * This is the class for the trash can that appears when dragging an app.
  */
 
 cr.define('ntp', function() {
   'use strict';
 
   /**
    * @constructor
+   * @extends {HTMLDivElement}
+   * @implements {cr.ui.DragWrapperDelegate}
    */
   function Trash(trash) {
     trash.__proto__ = Trash.prototype;
     trash.initialize();
     return trash;
   }
 
   Trash.prototype = {
     __proto__: HTMLDivElement.prototype,
 
     initialize: function(element) {
       this.dragWrapper_ = new cr.ui.DragWrapper(this, this);
     },
 
     /**
      * Determines whether we are interested in the drag data for |e|.
      * @param {Event} e The event from drag enter.
      * @return {boolean} True if we are interested in the drag data for |e|.
      */
     shouldAcceptDrag: function(e) {
       var tile = ntp.getCurrentlyDraggingTile();
       if (!tile)
         return false;
 
       return tile.firstChild.canBeRemoved();
     },
 
-    /**
-     * Drag over handler.
-     * @param {Event} e The drag event.
-     */
+    /** @override */
     doDragOver: function(e) {
       ntp.getCurrentlyDraggingTile().dragClone.classList.add(
           'hovering-on-trash');
       ntp.setCurrentDropEffect(e.dataTransfer, 'move');
       e.preventDefault();
     },
 
-    /**
-     * Drag enter handler.
-     * @param {Event} e The drag event.
-     */
+    /** @override */
     doDragEnter: function(e) {
       this.doDragOver(e);
     },
 
-    /**
-     * Drop handler.
-     * @param {Event} e The drag event.
-     */
+    /** @override */
     doDrop: function(e) {
       e.preventDefault();
 
       var tile = ntp.getCurrentlyDraggingTile();
       tile.firstChild.removeFromChrome();
       tile.landedOnTrash = true;
     },
 
-    /**
-     * Drag leave handler.
-     * @param {Event} e The drag event.
-     */
+    /** @override */
     doDragLeave: function(e) {
       ntp.getCurrentlyDraggingTile().dragClone.classList.remove(
           'hovering-on-trash');
     },
   };
 
   return {
     Trash: Trash,
   };
 });