ref: 71b38a144ebc50cb8bb043366ae959267acf4206
parent: 3ec20445b28ceccb0a32727f81ef2659596aaf33
author: Linfeng Zhang <linfengz@google.com>
date: Tue Sep 5 11:07:00 EDT 2017
Add 2 to 1 scaling NEON optimization BUG=webm:1419 Change-Id: I99c954ffa50a62ccff2c4ab54162916141826d9b