ref: a45596cff7bce21db776dbae8df88844db46c0e8
parent: 5fd142e763ce2760ff118b91b92714f1978e3d0b
parent: 45df87ca5798e495ee1d5d037e6e9db731617c45
author: Yaowu Xu <yaowu@google.com>
date: Wed May 11 14:02:00 EDT 2016
Merge "Added a measure of rc drift."