set_local was implemented before, but not added to any list of
alternatives. tee_local is now additionally implemented and added.

R=ahaas@chromium.org

Change-Id: I51f0b35c7b507e8af06efd1f9baac30790f28a3b
Reviewed-on: https://chromium-review.googlesource.com/860460Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50505}