ref: 4745bc2ff30f5ab344202685e103a49aa56adf07
parent: c94dacc23171366b3abd83850963c05debe8277b
parent: a6874985e2e7449a85cc0ad04930e41169e961e4
author: Zoe Liu <zoeliu@google.com>
date: Fri Jul 6 17:47:28 EDT 2018
Merge "Add hierarchical structure based ref frame update"