Note that because it is now a gerrit footer, it both appears in the same block
as the Change-Id footer (no blank line between them), and isn't guaranteed to be
above the Change-Id footer. This doesn't matter during "git cl upload", when
a Change-Id hasn't been allocated yet, but will show up during "git cl
description".

Bug: 681184
Change-Id: I2ab6fc13be8e992709618a666012410b1a7c02de
Reviewed-on: https://chromium-review.googlesource.com/446660
Commit-Queue: Aaron Gable <agable@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>