Homestyx hydra

R1:d4632f4b78a0

Restore "Land Revision" action to UI

Summary: This was accidentally caught in the crossfire in D18150. This is stable enough to formalize instead of adding with an event hook.

Test Plan: Looked at a candidate revision, saw "Land Revision" appear in UI again.

Reviewers: chad

Reviewed By: chad

Differential Revision: https://secure.phabricator.com/D18154
Repository: R1 hydra
Commit Date: Jun 26 2017