[graphite] Add ResourceProvider to Gpu

Bug: skia:12466
Change-Id: I1224ad193bb9d866439673161075e29adedc0008
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/456475
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
2 files changed