Re-enable Eager Gesture Recognition on Aura

ui/events/gesture_detection/touch_disposition_gesture_filter.cc

Index: ui/events/gesture_detection/touch_disposition_gesture_filter.cc
diff --git a/ui/events/gesture_detection/touch_disposition_gesture_filter.cc b/ui/events/gesture_detection/touch_disposition_gesture_filter.cc
index 564d014a4c5f94c28a7bd9a72be4ec1c8c84d594..b1ea1a7a74365bc9801f4c643705e818eb6bc304 100644
--- a/ui/events/gesture_detection/touch_disposition_gesture_filter.cc
+++ b/ui/events/gesture_detection/touch_disposition_gesture_filter.cc
@@ -207,6 +207,19 @@ void TouchDispositionGestureFilter::OnTouchEventAck(bool event_consumed) {
     FilterAndSendPacket(packet);
   }
   DCHECK(touch_packet_for_current_ack_handled);
+
+  // If the next event is invalid, treat it as though we just
+  // received a "consumed" ack for the event.
+  if (!sequence.empty() && sequence.back().marked_to_ignore())
+    OnTouchEventAck(true);
+}
+
+void TouchDispositionGestureFilter::IgnoreLastTouchEvent() {
+  DCHECK(!Tail().empty());
+  if (Tail().size() == 1)
+    OnTouchEventAck(true);
+  else
+    Tail().back().mark_to_ignore();
 }
 
 bool TouchDispositionGestureFilter::IsEmpty() const {