As part of the tint -> dawn merge.
Bug: dawn:1275
Change-Id: Ice0c9d2f03f6d7e96471cf8398aecd16273c833f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/78400
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>