Implemented in

    https://chromium-review.googlesource.com/c/angle/angle/+/1452740

was missing exposure from the Vulkan backend.

Bug: angleproject:3105
Change-Id: If82e6f3dfa5ff8fafbc401258a5e324ea311123d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1773906Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>