ref: 3cbe7679727c43cd4fee2b708fd97a5a475a1c58
parent: 73372cc09a33e26f1f535d9fd6fe02fc8a60fd56
parent: e085fb643fb6f1801689740eaedb07f5fbd1c620
author: Hui Su <huisu@google.com>
date: Tue Nov 3 15:55:14 EST 2015
Merge "Generate intra prediction reference values only when necessary"