ref: 62de07c8c66f2e158e6836789188b7158ebee6f2
parent: 4f860dba7822a6920c812ada0a5d4ecdd20d62f2
author: hkuang <hkuang@google.com>
date: Thu Dec 4 09:44:23 EST 2014
Merge set_prev_mi function into encoder function. Change-Id: Ifcf2efbb232ea4cabcdebbe77e0820d121e4a6da