tree 1ff1c4b31a8c9c2f27c97b79f55fcd933953dc25
parent 120f1b35474e62e23c3d34c742736f5177a9074d
author Stephen Li <stephenli@google.com> 1502841637 -0700
committer Stephen Li <stephenli@google.com> 1502841637 -0700

Add documentation for contextUserId.

Change-Id: I1e1701a1a2495b486c04937e027337789ab3fb5f