No longer forward refs and unrefs from the GrSurfaceProxy to the backing GrSurface

This is setting up for GrIORefProxy to just become SkRefCnt and GrProxyRef to just become sk_sp.

Change-Id: Ica66565a353de980a7070e0788f1f2b17565baee
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/220297
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
20 files changed