This intended to let us experiment w/ threaded compilation before having
to worry about upstreaming features.
Change-Id: Id9d1807de0fa16475184203d293e00bfaf5fcc01
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/373736
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Adlai Holler <adlai@google.com>
