Add unsigned-short as a supported depth format
The spec was recently updated to add an "unsigned-short" format. For the
purposes of CPU-Optimized data (the only type that we support), this is
functionally equivalent to the "luminance-alpha" type.
Fixed: 344484984
Change-Id: Ie9c8a8e3dc950ffe58382e87ba15964d99ddb56c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5594552
Reviewed-by: Piotr Bialecki bialpio@chromium.org
Reviewed-by: Will Harris wfh@chromium.org
Commit-Queue: Alexander Cooper alcooper@chromium.org
Cr-Commit-Position: refs/heads/main@{#1310048}