Articulate the cancel behavior in WebMouseWheelEvent.

third_party/WebKit/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 43 matching lines @@
 
     static WheelEvent* create(const AtomicString& type, const WheelEventInit& initializer)
     {
         return new WheelEvent(type, initializer);
     }
 
     static WheelEvent* create(const FloatPoint& wheelTicks,
         const FloatPoint& rawDelta, unsigned deltaMode, AbstractView* view,
         const IntPoint& screenLocation, const IntPoint& windowLocation,
         PlatformEvent::Modifiers modifiers, unsigned short buttons, double platformTimeStamp,
-        bool canScroll, int resendingPluginId, bool hasPreciseScrollingDeltas, RailsMode railsMode)
+        bool canScroll, int resendingPluginId, bool hasPreciseScrollingDeltas, RailsMode railsMode, bool cancelable)
     {
         return new WheelEvent(wheelTicks, rawDelta, deltaMode, view,
             screenLocation, windowLocation, modifiers, buttons, platformTimeStamp,
-            canScroll, resendingPluginId,  hasPreciseScrollingDeltas, railsMode);
+            canScroll, resendingPluginId, hasPreciseScrollingDeltas, railsMode, cancelable);
     }
 
     double deltaX() const { return m_deltaX; } // Positive when scrolling right.
     double deltaY() const { return m_deltaY; } // Positive when scrolling down.
     double deltaZ() const { return m_deltaZ; }
     int wheelDelta() const { return wheelDeltaY() ? wheelDeltaY() : wheelDeltaX(); } // Deprecated.
     int wheelDeltaX() const { return m_wheelDelta.x(); } // Deprecated, negative when scrolling right.
     int wheelDeltaY() const { return m_wheelDelta.y(); } // Deprecated, negative when scrolling down.
     unsigned deltaMode() const { return m_deltaMode; }
     float ticksX() const { return static_cast<float>(m_wheelDelta.x()) / TickMultiplier; }
@@ skipping 10 matching lines @@
     EventDispatchMediator* createMediator() override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     WheelEvent();
     WheelEvent(const AtomicString&, const WheelEventInit&);
     WheelEvent(const FloatPoint& wheelTicks, const FloatPoint& rawDelta,
         unsigned, AbstractView*, const IntPoint& screenLocation, const IntPoint& windowLocation,
         PlatformEvent::Modifiers, unsigned short buttons, double platformTimeStamp,
-        bool canScroll, int resendingPluginId, bool hasPreciseScrollingDeltas, RailsMode);
+        bool canScroll, int resendingPluginId, bool hasPreciseScrollingDeltas, RailsMode, bool cancelable);
 
     IntPoint m_wheelDelta;
     double m_deltaX;
     double m_deltaY;
     double m_deltaZ;
     unsigned m_deltaMode;
     bool m_canScroll;
     int m_resendingPluginId;
     bool m_hasPreciseScrollingDeltas;
     RailsMode m_railsMode;
 };
 
 DEFINE_EVENT_TYPE_CASTS(WheelEvent);
 
 } // namespace blink
 
 #endif // WheelEvent_h