[graphite] Track aggregate protected status on YUVA images

Change-Id: Ie10ccc2b5d7004d57e67199eeb31ccc4b8792521
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/836916
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
3 files changed