See https://github.com/gpuweb/gpuweb/pull/1927
Adds a typedef to make a gradual deprecation.
Bug: dawn:1023
Change-Id: Ic81a933a95556fbf5726056530788dde017a1449
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/59442
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>