Add GestureTapCancel gesture type

content/browser/renderer_host/gesture_event_filter.cc

Index: content/browser/renderer_host/gesture_event_filter.cc
diff --git a/content/browser/renderer_host/gesture_event_filter.cc b/content/browser/renderer_host/gesture_event_filter.cc
index f68182469f54ea31fb94b0e21ec964ba44f3b71d..663fccfac983f962b966314dd95eddb05052549a 100644
--- a/content/browser/renderer_host/gesture_event_filter.cc
+++ b/content/browser/renderer_host/gesture_event_filter.cc
@@ -142,6 +142,7 @@ void GestureEventFilter::Reset() {
 }
 
 void GestureEventFilter::ProcessGestureAck(bool processed, int type) {
+  DCHECK_EQ(coalesced_gesture_events_.front().type, type);
   coalesced_gesture_events_.pop_front();
   if (!coalesced_gesture_events_.empty()) {
     WebGestureEvent next_gesture_event = coalesced_gesture_events_.front();