tree a3745b1ef55f807d3a24c62fdb0f383b0ff10b5f
parent 609c3ac6a8d4943f1d1f1ef8e2ee5bcfa5a6a547
author Stephen Li <stephenli@google.com> 1497387663 -0700
committer Stephen Li <stephenli@google.com> 1497393381 -0700

Add REST API endpoint for all downstream branches.

In addition to having an endpoint telling us what branches are a single
automerger downstream hop down, we also have an endpoint telling us all
the branches that are downstream of a given branch.

Change-Id: Ie839e1dd8e9764b9134478569f5c9024efbea285