Updating Clipboard.setDragImage to accept elements.

sdk/lib/html/dart2js/html_dart2js.dart

 /// The Dart HTML library.
 library dart.dom.html;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_collection-dev' hide Symbol;
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json' as json;
@@ skipping 5675 matching lines @@
   @DomName('Clipboard.getData')
   @DocsEditable
   String getData(String type) native;
 
   @DomName('Clipboard.setData')
   @DocsEditable
   bool setData(String type, String data) native;
 
   @DomName('Clipboard.setDragImage')
   @DocsEditable
-  void setDragImage(ImageElement image, int x, int y) native;
+  void setDragImage(Element element, int x, int y) native;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('DataTransferItem')
 // http://www.w3.org/TR/2011/WD-html5-20110113/dnd.html#the-datatransferitem-interface
 @Experimental
@@ skipping 23639 matching lines @@
       _position = nextPosition;
       return true;
     }
     _current = null;
     _position = _array.length;
     return false;
   }
 
   T get current => _current;
 }