R=titzer@chromium.org

Change-Id: Ia39d4ec981e6a539cc7466c7b20ff5bd85a49090
Reviewed-on: https://chromium-review.googlesource.com/c/1274266Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#56543}