[graphite] Add Image::Copy to handle both blit and draw copies

Bug: b/333909822
Change-Id: I5dbc33aa9b72b6509d9cd503eaf4f7a8dcde5669
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/838236
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
4 files changed