Articulate the cancel behavior in the WebTouchEvent.

third_party/WebKit/Source/web/WebInputEventConversion.cpp

Index: third_party/WebKit/Source/web/WebInputEventConversion.cpp
diff --git a/third_party/WebKit/Source/web/WebInputEventConversion.cpp b/third_party/WebKit/Source/web/WebInputEventConversion.cpp
index b020b0fefe2505da660ce60447e3fab4555fcdfd..52ed837267f405b91058a18f9a3ff85eea0cee51 100644
--- a/third_party/WebKit/Source/web/WebInputEventConversion.cpp
+++ b/third_party/WebKit/Source/web/WebInputEventConversion.cpp
@@ -457,7 +457,7 @@ PlatformTouchEventBuilder::PlatformTouchEventBuilder(Widget* widget, const WebTo
     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)
@@ -717,7 +717,7 @@ WebTouchEventBuilder::WebTouchEventBuilder(const LayoutObject* layoutObject, con
 
     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.