Remove texture idle proc mechanism

Bug: skia:11369
Change-Id: I0d1a74cc64dd74486acbb69df529ccc0f8b63ef3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/375202
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
15 files changed