Add support for DOM Level 3 WheelEvent

Source/core/dom/WheelEvent.idl

 /*
  * Copyright (C) 2006, 2007, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
+ * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * 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.
  */
 
+// Introduced in DOM Level 3:
 [
     ConstructorTemplate=Event
 ] interface WheelEvent : MouseEvent {
+    // DeltaModeCode
     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 long deltaX;

[do-not-use, 2013/08/16 09:57:16]

These should be "double", not "long". I'll fix this in the next iteration as
well.

[do-not-use, 2013/08/16 12:02:50]

Done.

+    [InitializedByEventConstructor] readonly attribute long deltaY;
+    // [InitializedByEventConstructor] readonly attribute long deltaZ;
     [InitializedByEventConstructor] readonly attribute unsigned long deltaMode;
 
+    // Non standard API.
+    [InitializedByEventConstructor, ImplementedAs=deltaX] readonly attribute long wheelDeltaX;

[arv (Not doing code reviews), 2013/08/15 14:05:44]

OK. I see, we use the same interface... this should also be deprecated when we
deprecate onmousewheel.

[do-not-use, 2013/08/16 12:02:50]

Right, I use the same interface because the interface name if the same as in the
standard and it is exposed to JavaScript already. We can deprecate (or measure
usage) of the non-standard API in a follow-up patch.

+    [InitializedByEventConstructor, ImplementedAs=deltaY] readonly attribute long wheelDeltaY;
     readonly attribute long wheelDelta;
 
     // WebKit Extension
     readonly attribute boolean webkitDirectionInvertedFromDevice;
 
     void initWebKitWheelEvent([Default=Undefined] optional long wheelDeltaX,
                               [Default=Undefined] optional long wheelDeltaY,
                               [Default=Undefined] optional Window view,
                               [Default=Undefined] optional long screenX,
                               [Default=Undefined] optional long screenY,
                               [Default=Undefined] optional long clientX,
                               [Default=Undefined] optional long clientY,
                               [Default=Undefined] optional boolean ctrlKey,
                               [Default=Undefined] optional boolean altKey,
                               [Default=Undefined] optional boolean shiftKey,
                               [Default=Undefined] optional boolean metaKey);
 };