[graphite] Add Image_YUVA::Wrap factory to handle validation

Change-Id: I13628676ec707f53f250634ef788e5a88082f6ad
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/838800
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
3 files changed