R=titzer@chromium.org

Change-Id: I26261e16a9db2b4b9622b1d4a3eab959fa24b7e3
Reviewed-on: https://chromium-review.googlesource.com/713496Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48489}