Articulate the cancel behavior in the WebTouchEvent.

content/common/input/web_touch_event_traits.cc

Index: content/common/input/web_touch_event_traits.cc
diff --git a/content/common/input/web_touch_event_traits.cc b/content/common/input/web_touch_event_traits.cc
index 175bf78ef41d8eb20457b8e874ec195845be86fb..77aa00f7069d08ba42a8e664264f922d5e44ef6c 100644
--- a/content/common/input/web_touch_event_traits.cc
+++ b/content/common/input/web_touch_event_traits.cc
@@ -52,7 +52,9 @@ void WebTouchEventTraits::ResetType(WebInputEvent::Type type,
                                     WebTouchEvent* event) {
   DCHECK(WebInputEvent::isTouchEventType(type));
   event->type = type;
-  event->cancelable = (type != WebInputEvent::TouchCancel);
+  event->dispatchType = type == WebInputEvent::TouchCancel
+                            ? WebInputEvent::EventNonBlocking
+                            : WebInputEvent::Blocking;
   event->timeStampSeconds = timestamp_sec;
 }