Add rails to input wheel events.

Source/core/events/WheelEvent.cpp

 /*
  * 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, 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 19 matching lines @@
 
 namespace blink {
 
 WheelEvent::WheelEvent()
     : m_deltaX(0)
     , m_deltaY(0)
     , m_deltaZ(0)
     , m_deltaMode(DOM_DELTA_PIXEL)
     , m_canScroll(true)
     , m_hasPreciseScrollingDeltas(false)
+    , m_railsMode(RailsModeFree)
 {
 }
 
 WheelEvent::WheelEvent(const AtomicString& type, const WheelEventInit& initializer)
     : MouseEvent(type, initializer)
     , m_wheelDelta(initializer.wheelDeltaX() ? initializer.wheelDeltaX() : -initializer.deltaX(), initializer.wheelDeltaY() ? initializer.wheelDeltaY() : -initializer.deltaY())
     , m_deltaX(initializer.deltaX() ? initializer.deltaX() : -initializer.wheelDeltaX())
     , m_deltaY(initializer.deltaY() ? initializer.deltaY() : -initializer.wheelDeltaY())
     , m_deltaZ(initializer.deltaZ())
     , m_deltaMode(initializer.deltaMode())
     , m_canScroll(true)
     , m_hasPreciseScrollingDeltas(false)
+    , m_railsMode(RailsModeFree)
 {
 }
 
 WheelEvent::WheelEvent(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)
+    bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short buttons, bool canScroll, bool hasPreciseScrollingDeltas, RailsMode railsMode)
     : MouseEvent(EventTypeNames::wheel, true, true, view, 0, screenLocation.x(), screenLocation.y(),
         windowLocation.x(), windowLocation.y(), 0, 0, ctrlKey, altKey, shiftKey, metaKey, 0, buttons,
         nullptr, nullptr, false, PlatformMouseEvent::RealOrIndistinguishable)
     , m_wheelDelta(wheelTicks.x() * TickMultiplier, wheelTicks.y() * TickMultiplier)
     , m_deltaX(-rawDelta.x())
     , m_deltaY(-rawDelta.y())
     , m_deltaZ(0)
     , m_deltaMode(deltaMode)
     , m_canScroll(canScroll)
     , m_hasPreciseScrollingDeltas(hasPreciseScrollingDeltas)
+    , m_railsMode(railsMode)
 {
 }
 
 const AtomicString& WheelEvent::interfaceName() const
 {
     return EventNames::WheelEvent;
 }
 
 bool WheelEvent::isMouseEvent() const
 {
@@ skipping 19 matching lines @@
 {
     return adoptRefWillBeNoop(new WheelEventDispatchMediator(event, view));
 }
 
 WheelEventDispatchMediator::WheelEventDispatchMediator(const PlatformWheelEvent& event, PassRefPtrWillBeRawPtr<AbstractView> view)
 {
     setEvent(WheelEvent::create(FloatPoint(event.wheelTicksX(), event.wheelTicksY()), FloatPoint(event.deltaX(), event.deltaY()),
         deltaMode(event), view, event.globalPosition(), event.position(),
         event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(),
         MouseEvent::platformModifiersToButtons(event.modifiers()),
-        event.canScroll(), event.hasPreciseScrollingDeltas()));
+        event.canScroll(), event.hasPreciseScrollingDeltas(),
+        static_cast<Event::RailsMode>(event.railsMode())));
 }
 
 WheelEvent& WheelEventDispatchMediator::event() const
 {
     return toWheelEvent(EventDispatchMediator::event());
 }
 
 bool WheelEventDispatchMediator::dispatchEvent(EventDispatcher& dispatcher) const
 {
     if (!(event().deltaX() || event().deltaY()))
         return true;
     return EventDispatchMediator::dispatchEvent(dispatcher) && !event().defaultHandled();
 }
 
 } // namespace blink