Add option for client to own semaphores after telling to skia to wait.

Bug: chromium:1004772
Change-Id: Ifdad0b12925d13d3e896f6321c35312f9daa330c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/301216
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
14 files changed