Add Metal support for dynamic texture state

Bug: skia:9604
Change-Id: I16f487137c79e37493cd24b63ee29ac2e22d6cec
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/254981
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
4 files changed