R=clemensh@chromium.org

Change-Id: I1dec320464f5bc80e248cdf0b31b4a095bc54994
Reviewed-on: https://chromium-review.googlesource.com/c/1495981Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59966}