Update WebKit idl files after chrome roll

third_party/WebCore/dom/WheelEvent.idl

 /*
  * Copyright (C) 2006, 2007, 2010 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 [
     ConstructorConditional=DOM4_EVENTS_CONSTRUCTOR,
     ConstructorTemplate=Event
 ] interface WheelEvent : MouseEvent {
+    const unsigned long              DOM_DELTA_PIXEL = 0x00;
+    const unsigned long              DOM_DELTA_LINE  = 0x01;
+    const unsigned long              DOM_DELTA_PAGE  = 0x02;
+
     [InitializedByEventConstructor] readonly attribute long wheelDeltaX;
     [InitializedByEventConstructor] readonly attribute long wheelDeltaY;
+    [InitializedByEventConstructor] readonly attribute unsigned long deltaMode;
 
     readonly attribute long wheelDelta;
 
     // WebKit Extension
     readonly attribute boolean webkitDirectionInvertedFromDevice;
 
 #if defined(LANGUAGE_OBJECTIVE_C) && LANGUAGE_OBJECTIVE_C
     readonly attribute boolean isHorizontal;
 #endif /* defined(LANGUAGE_OBJECTIVE_C) */
 
@@ skipping 18 matching lines @@
                               in [Optional=DefaultIsUndefined] long screenX,
                               in [Optional=DefaultIsUndefined] long screenY,
                               in [Optional=DefaultIsUndefined] long clientX,
                               in [Optional=DefaultIsUndefined] long clientY,
                               in [Optional=DefaultIsUndefined] boolean ctrlKey,
                               in [Optional=DefaultIsUndefined] boolean altKey,
                               in [Optional=DefaultIsUndefined] boolean shiftKey,
                               in [Optional=DefaultIsUndefined] boolean metaKey);
 #endif /* defined(LANGUAGE_JAVASCRIPT) */
 };