DO NOT MERGE Fix the mouse wheel orientation for the consistency with AbsListView.

The meaning of scroll value is different between RecyclerView and
AbsListView. Therefore the sign of the scroll value from the
motion event should be inversed in RecyclerView to have the same
scroll orienation for mouse wheels among views.

Bug: 20125071
Change-Id: Iba33b7dedae61432fb399bef28639435c08e6ded
(cherry picked from commit 9daf256d3b66ecb94d9848731abe96f3655904b0)
1 file changed