ref: ac211fe23efac5fcba6d3f26953c4fa737d053ec
parent: 3c73e587d118b8cca2de1e5436273e8b039195f7
author: Jerome Jiang <jianj@google.com>
date: Fri Jul 28 12:34:04 EDT 2017
vp9: Adjust logic in source sad for screen content. Change-Id: I917d106f4c95ea44e413e23881f6303982e1a6a3