[graphite] Propagate Protectedness throughout Vulkan backend

Bug: b/237108194
Change-Id: I45704064beed128b862c42d69831d7ce043ec32a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/787438
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Nicolette Prevost <nicolettep@google.com>
5 files changed