Bindings for CSSOM View smooth scroll API

Source/core/dom/Element.idl

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
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     [PerWorldBindings] readonly attribute long offsetLeft;
     [PerWorldBindings] readonly attribute long offsetTop;
     [PerWorldBindings] readonly attribute long offsetWidth;
     [PerWorldBindings] readonly attribute long offsetHeight;
     [ImplementedAs=offsetParentForBindings, PerWorldBindings] readonly attribute Element offsetParent;
     [PerWorldBindings] readonly attribute long clientLeft;
     [PerWorldBindings] readonly attribute long clientTop;
     [PerWorldBindings] readonly attribute long clientWidth;
     [PerWorldBindings] readonly attribute long clientHeight;
-    [PerWorldBindings] attribute long scrollLeft;
-    [PerWorldBindings] attribute long scrollTop;
+    [PerWorldBindings, Custom=Setter] attribute long scrollLeft;
+    [PerWorldBindings, Custom=Setter] attribute long scrollTop;
     [PerWorldBindings] readonly attribute long scrollWidth;
     [PerWorldBindings] readonly attribute long scrollHeight;
 
     void focus();
     void blur();
     void scrollIntoView(optional boolean alignWithTop);
 
     // WebKit extensions
 
     void scrollIntoViewIfNeeded(optional boolean centerIfNeeded);
@@ skipping 57 matching lines @@
     [RuntimeEnabled=Touch] attribute EventHandler ontouchend;
     [RuntimeEnabled=Touch] attribute EventHandler ontouchmove;
     [RuntimeEnabled=Touch] attribute EventHandler ontouchstart;
     attribute EventHandler onwebkitfullscreenchange;
     attribute EventHandler onwebkitfullscreenerror;
     [PerWorldBindings, ActivityLogging=SetterForIsolatedWorlds] attribute EventHandler onwheel;
 };
 
 Element implements ParentNode;
 Element implements ChildNode;