Add support for DOM Level 3 WheelEvent

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,
@@ skipping 144 matching lines @@
     [NotEnumerable, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds] attribute EventHandler onkeypress;
     [NotEnumerable, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds] attribute EventHandler onkeyup;
     [NotEnumerable, PerWorldBindings] attribute EventHandler onload;
     [NotEnumerable, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds] attribute EventHandler onmousedown;
     [NotEnumerable, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds] attribute EventHandler onmouseenter;
     [NotEnumerable, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds] attribute EventHandler onmouseleave;
     [NotEnumerable, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds] attribute EventHandler onmousemove;
     [NotEnumerable, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds] attribute EventHandler onmouseout;
     [NotEnumerable, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds] attribute EventHandler onmouseover;
     [NotEnumerable, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds] attribute EventHandler onmouseup;
-    [NotEnumerable, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds] attribute EventHandler onmousewheel;
+    [NotEnumerable, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds] attribute EventHandler onmousewheel; // Deprecated in favor of onwheel.
+    [NotEnumerable, PerWorldBindings, ActivityLog=SetterForIsolatedWorlds] attribute EventHandler onwheel;
     [NotEnumerable, PerWorldBindings] attribute EventHandler onscroll;
     [NotEnumerable, PerWorldBindings] attribute EventHandler onselect;
     [NotEnumerable, PerWorldBindings] attribute EventHandler onsubmit;
 
     // attribute [NotEnumerable] EventHandler oncanplay;
     // attribute [NotEnumerable] EventHandler oncanplaythrough;
     // attribute [NotEnumerable] EventHandler ondurationchange;
     // attribute [NotEnumerable] EventHandler onemptied;
     // attribute [NotEnumerable] EventHandler onended;
     // attribute [NotEnumerable] EventHandler onloadeddata;
@@ skipping 27 matching lines @@
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventHandler ontouchstart;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventHandler ontouchmove;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventHandler ontouchend;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventHandler ontouchcancel;
     [NotEnumerable, PerWorldBindings] attribute EventHandler onwebkitfullscreenchange;
     [NotEnumerable, PerWorldBindings] attribute EventHandler onwebkitfullscreenerror;
 };
 
 Element implements ParentNode;
 Element implements ChildNode;