[Graphite] Add support for labels on user created SkSurfaces.

Bug: b/308986480
Change-Id: I6939f255f24277ca7edda1cea3278f8f7b64ec5a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/855416
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
14 files changed