Virtualize EventDispatchMediator creation and cleanup calling.

Source/core/events/WheelEvent.h

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2010 Apple Inc. All rights reserved.
  * 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
@@ skipping 33 matching lines @@
         DOM_DELTA_PIXEL = 0,
         DOM_DELTA_LINE,
         DOM_DELTA_PAGE
     };
 
     static PassRefPtrWillBeRawPtr<WheelEvent> create()
     {
         return adoptRefWillBeNoop(new WheelEvent);
     }
 
+    static PassRefPtrWillBeRawPtr<WheelEvent> create(const PlatformWheelEvent& platformEvent, PassRefPtrWillBeRawPtr<AbstractView>);
+
     static PassRefPtrWillBeRawPtr<WheelEvent> create(const AtomicString& type, const WheelEventInit& initializer)
     {
         return adoptRefWillBeNoop(new WheelEvent(type, initializer));
     }
 
     static PassRefPtrWillBeRawPtr<WheelEvent> create(const FloatPoint& wheelTicks,
         const FloatPoint& rawDelta, unsigned deltaMode, PassRefPtrWillBeRawPtr<AbstractView> view,
         const IntPoint& screenLocation, const IntPoint& windowLocation,
         bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short buttons, bool canScroll, bool hasPreciseScrollingDeltas, RailsMode railsMode)
     {
@@ skipping 11 matching lines @@
     float ticksX() const { return static_cast<float>(m_wheelDelta.x()) / TickMultiplier; }
     float ticksY() const { return static_cast<float>(m_wheelDelta.y()) / TickMultiplier; }
     bool canScroll() const { return m_canScroll; }
     bool hasPreciseScrollingDeltas() const { return m_hasPreciseScrollingDeltas; }
     RailsMode railsMode() const { return m_railsMode; }
 
     const AtomicString& interfaceName() const override;
     bool isMouseEvent() const override;
     bool isWheelEvent() const override;
 
+    PassRefPtrWillBeRawPtr<EventDispatchMediator> createMediator() override;
+
     DECLARE_VIRTUAL_TRACE();
 
 private:
     WheelEvent();
     WheelEvent(const AtomicString&, const WheelEventInit&);
     WheelEvent(const FloatPoint& wheelTicks, const FloatPoint& rawDelta,
         unsigned, PassRefPtrWillBeRawPtr<AbstractView>, const IntPoint& screenLocation, const IntPoint& windowLocation,
         bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short buttons, bool canScroll, bool hasPreciseScrollingDeltas, RailsMode);
 
     IntPoint m_wheelDelta;
     double m_deltaX;
     double m_deltaY;
     double m_deltaZ;
     unsigned m_deltaMode;
     bool m_canScroll;
     bool m_hasPreciseScrollingDeltas;
     RailsMode m_railsMode;
 };
 
 DEFINE_EVENT_TYPE_CASTS(WheelEvent);
 
 class WheelEventDispatchMediator final : public EventDispatchMediator {
 public:
-    static PassRefPtrWillBeRawPtr<WheelEventDispatchMediator> create(const PlatformWheelEvent&, PassRefPtrWillBeRawPtr<AbstractView>);
+    static PassRefPtrWillBeRawPtr<WheelEventDispatchMediator> create(PassRefPtrWillBeRawPtr<WheelEvent>);
+
 private:
-    WheelEventDispatchMediator(const PlatformWheelEvent&, PassRefPtrWillBeRawPtr<AbstractView>);
+    explicit WheelEventDispatchMediator(PassRefPtrWillBeRawPtr<WheelEvent>);
     WheelEvent& event() const;
     bool dispatchEvent(EventDispatcher&) const override;
 };
 
 } // namespace blink
 
 #endif // WheelEvent_h