Drag and drop cleans up touch sequences from the source window.

ui/events/gestures/gesture_recognizer_impl_mac.cc

Index: ui/events/gestures/gesture_recognizer_impl_mac.cc
diff --git a/ui/events/gestures/gesture_recognizer_impl_mac.cc b/ui/events/gestures/gesture_recognizer_impl_mac.cc
index f48f870058314bd6df25fc42d942145beb00ea9a..8202e9175c09338a9b61bb2fc15cde15e11f4532 100644
--- a/ui/events/gestures/gesture_recognizer_impl_mac.cc
+++ b/ui/events/gestures/gesture_recognizer_impl_mac.cc
@@ -40,8 +40,10 @@ class GestureRecognizerImplMac : public GestureRecognizer {
     return NULL;
   }
   void CancelActiveTouchesExcept(GestureConsumer* not_cancelled) override {}
-  void TransferEventsTo(GestureConsumer* current_consumer,
+  void BeginDragAndDrop(GestureConsumer* current_consumer,
                         GestureConsumer* new_consumer) override {}
+  void BeginTabDrag(GestureConsumer* current_consumer,
+                    GestureConsumer* new_consumer) override {}
   bool GetLastTouchPointForTarget(GestureConsumer* consumer,
                                   gfx::PointF* point) override {
     return false;