[Aura] Initial app list webui.

chrome/browser/resources/shared/js/cr/ui/drag_wrapper.js

 // 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.
 
 /**
  * @fileoverview DragWrapper
  * A class for simplifying HTML5 drag and drop. Classes should use this to
  * handle the nitty gritty of nested drag enters and leaves.
  */
-var DragWrapper = (function() {
+cr.define('cr.ui', function() {
   /**
    * Creates a DragWrapper which listens for drag target events on |target| and
    * delegates event handling to |handler|. The |handler| must implement:
    *   shouldAcceptDrag
    *   doDragEnter
    *   doDragLeave
    *   doDragOver
    *   doDrop
    */
   function DragWrapper(target, handler) {
@@ skipping 84 matching lines @@
      */
     onDragLeave_: function(e) {
       if (--this.dragEnters_ > 0)
         return;
 
       this.target_.classList.remove('drag-target');
       this.handler_.doDragLeave(e);
     },
   };
 
-  return DragWrapper;
-})();
+  return {
+    DragWrapper: DragWrapper
+  };
+});