Articulate the cancel behavior in WebMouseWheelEvent.

third_party/WebKit/Source/web/WebInputEventConversion.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 193 matching lines @@
     m_deltaY = scaleDeltaToWindow(widget, e.deltaY);
     m_wheelTicksX = e.wheelTicksX;
     m_wheelTicksY = e.wheelTicksY;
     m_granularity = e.scrollByPage ?
         ScrollByPageWheelEvent : ScrollByPixelWheelEvent;
 
     m_type = PlatformEvent::Wheel;
 
     m_timestamp = e.timeStampSeconds;
     m_modifiers = e.modifiers;
+    m_dispatchType = toPlatformDispatchType(e.dispatchType);
 
     m_hasPreciseScrollingDeltas = e.hasPreciseScrollingDeltas;
     m_canScroll = e.canScroll;
     m_resendingPluginId = e.resendingPluginId;
     m_railsMode = static_cast<PlatformEvent::RailsMode>(e.railsMode);
 #if OS(MACOSX)
     m_phase = static_cast<PlatformWheelEventPhase>(e.phase);
     m_momentumPhase = static_cast<PlatformWheelEventPhase>(e.momentumPhase);
     m_canRubberbandLeft = e.canRubberbandLeft;
     m_canRubberbandRight = e.canRubberbandRight;
@@ skipping 392 matching lines @@
     updateWebMouseEventFromCoreMouseEvent(event, widget, *layoutObject, *this);
     deltaX = -event.deltaX();
     deltaY = -event.deltaY();
     wheelTicksX = event.ticksX();
     wheelTicksY = event.ticksY();
     scrollByPage = event.deltaMode() == WheelEvent::DOM_DELTA_PAGE;
     canScroll = event.canScroll();
     resendingPluginId = event.resendingPluginId();
     railsMode = static_cast<RailsMode>(event.getRailsMode());
     hasPreciseScrollingDeltas = event.hasPreciseScrollingDeltas();
+    dispatchType = event.cancelable() ? WebInputEvent::Blocking : WebInputEvent::EventNonBlocking;
 }
 
 WebKeyboardEventBuilder::WebKeyboardEventBuilder(const KeyboardEvent& event)
 {
     if (event.type() == EventTypeNames::keydown)
         type = KeyDown;
     else if (event.type() == EventTypeNames::keyup)
         type = WebInputEvent::KeyUp;
     else if (event.type() == EventTypeNames::keypress)
         type = WebInputEvent::Char;
@@ skipping 163 matching lines @@
         break;
     case GestureSourceTouchscreen:
         sourceDevice = WebGestureDeviceTouchscreen;
         break;
     case GestureSourceUninitialized:
         NOTREACHED();
     }
 }
 
 } // namespace blink