tree 2798f4aadc92302ae2b84a1f4056f291ae76a66e
parent 21327180296478a924a1d263ff2ccbe17d474e33
author Steve Hsu <stevehsu@google.com> 1426177811 -0700
committer Steve Hsu <stevehsu@google.com> 1426185618 -0700

Add method to return covariance in tangent space

This CL is required to build Tango.

Inspired by this commit in RedwoodInternal repository:
  commit 09dde53c248e04f432b5eccceea5daeedb706aea
  Author: Mike Vitus <mike@hidof.com>
  Date:   Wed Apr 23 11:05:17 2014 -0700

Change-Id: I328b6634969de4ccdd71947945aa67a49ee9073f