R=titzer@chromium.org

Change-Id: Ib855271457ffd737abe7fa37ebf7a03a5bda9ee4
Reviewed-on: https://chromium-review.googlesource.com/940170Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Brad Nelson <bradnelson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51667}