R=titzer@chromium.org

Change-Id: I18a4bcdb002d63c0d5476ce4ff3edd466489b518
Reviewed-on: https://chromium-review.googlesource.com/785092Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49567}