Migrate resource cache methods to GrDirectContext

Cut and paste job.

Change-Id: If9b7e0f74b16b2559dc4149f81720df96b09761e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/325461
Auto-Submit: Adlai Holler <adlai@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
4 files changed