ref: 3134a52d26cc8deff4bd197537aca6cfdc597e44
parent: 897543646644410f91d381589ba56aecc28dfa3e
author: Marco <marpan@google.com>
date: Thu Apr 20 05:50:16 EDT 2017
vp9: SVC: Redefine the source downsample filter choice. Rename the source downsampling filter, and define it per spatial layers. Used 1 pass CBR SVC. Change-Id: I8135f2ab89c535c53429b9c58b586f746bb668c7