The helper functions for slop region check and subtraction are modified.

ui/events/test/motion_event_test_utils.h

Index: ui/events/test/motion_event_test_utils.h
diff --git a/ui/events/test/motion_event_test_utils.h b/ui/events/test/motion_event_test_utils.h
index 68cb8cd65199bd757ebf2de8989a2a82030150d7..a03a92827b4c790787e11d7a8a9bed93370616eb 100644
--- a/ui/events/test/motion_event_test_utils.h
+++ b/ui/events/test/motion_event_test_utils.h
@@ -48,6 +48,7 @@ struct MockMotionEvent : public MotionEventGeneric {
   MockMotionEvent& PressPoint(float x, float y);
   MockMotionEvent& MovePoint(size_t index, float x, float y);
   MockMotionEvent& ReleasePoint();
+  MockMotionEvent& ReleasePointAtIndex(size_t index);
   MockMotionEvent& CancelPoint();
   MockMotionEvent& SetTouchMajor(float new_touch_major);
   MockMotionEvent& SetRawOffset(float raw_offset_x, float raw_offset_y);