ref: 89af744ba6450daa55d2985c826fa58c8317e8d8
parent: d04a0d77fb0a26a7f1bb9cb684aa7c3fb400bd99
author: Jingning Han <jingning@google.com>
date: Fri Aug 14 11:27:02 EDT 2015
Change vp9_ prefix function names in vpx_scale to vpx_ Change-Id: Iac85902cbbb3e752801dc85de9a3c778e47304aa