ref: dbed479d79be9361cabc5ddfdbe449c7ebbdf68e
parent: 1935dfb294c1dec48101dc2ce5c741a3b9f14eb6
author: Jerome Jiang <jianj@google.com>
date: Tue Mar 21 11:33:42 EDT 2017
Fix the data race caused by vp9 denoiser. BUG=webm:1391 Change-Id: I9669ae62fe9c695d4c6f9973094cb0f39bed51c7