Articulate the cancel behavior in the WebTouchEvent.

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 439 matching lines @@
 PlatformTouchEventBuilder::PlatformTouchEventBuilder(Widget* widget, const WebTouchEvent& event)
 {
     m_type = toPlatformTouchEventType(event.type);
     m_modifiers = event.modifiers;
     m_timestamp = event.timeStampSeconds;
     m_causesScrollingIfUncanceled = event.movedBeyondSlopRegion;
 
     for (unsigned i = 0; i < event.touchesLength; ++i)
         m_touchPoints.append(PlatformTouchPointBuilder(widget, event.touches[i]));
 
-    m_cancelable = event.cancelable;
+    m_cancelable = event.dispatchType == WebInputEvent::Blocking;
 }
 
 static FloatPoint convertAbsoluteLocationForLayoutObjectFloat(const LayoutPoint& location, const LayoutObject& layoutObject)
 {
     return layoutObject.absoluteToLocal(FloatPoint(location), UseTransforms);
 }
 
 static IntPoint convertAbsoluteLocationForLayoutObject(const LayoutPoint& location, const LayoutObject& layoutObject)
 {
     return roundedIntPoint(convertAbsoluteLocationForLayoutObjectFloat(location, layoutObject));
@@ skipping 239 matching lines @@
     else if (event.type() == EventTypeNames::touchcancel)
         type = TouchCancel;
     else {
         NOTREACHED();
         type = Undefined;
         return;
     }
 
     timeStampSeconds = event.platformTimeStamp();
     modifiers = event.modifiers();
-    cancelable = event.cancelable();
+    dispatchType = event.cancelable() ? WebInputEvent::Blocking : WebInputEvent::NonBlocking;
     movedBeyondSlopRegion = event.causesScrollingIfUncanceled();
 
     // Currently touches[] is empty, add stationary points as-is.
     for (unsigned i = 0; i < event.touches()->length() && i < static_cast<unsigned>(WebTouchEvent::touchesLengthCap); ++i) {
         touches[i] = toWebTouchPoint(event.touches()->item(i), layoutObject, WebTouchPoint::StateStationary);
         ++touchesLength;
     }
     // If any existing points are also in the change list, we should update
     // their state, otherwise just add the new points.
     addTouchPointsUpdateStateIfNecessary(toWebTouchPointState(event.type()), event.changedTouches(), touches, &touchesLength, layoutObject);
@@ skipping 52 matching lines @@
         break;
     case GestureSourceTouchscreen:
         sourceDevice = WebGestureDeviceTouchscreen;
         break;
     case GestureSourceUninitialized:
         NOTREACHED();
     }
 }
 
 } // namespace blink