ref: 5f8e24161e4c5c565e6135a51232d95ccdd3dfd9
parent: 9a9ff2d80485486e3de331080a257146724f51dc
author: Jerome Jiang <jianj@google.com>
date: Fri Jun 8 06:53:34 EDT 2018
vp9 svc: clean up first_spatial_layer_to_encode. Change-Id: I3c9aefd3ea5028797b9105d7e49b1cb2f762a9fc