This is a reland of 0596094b81
Original change's description:
> Remove skstd::optional entirely.
>
> Change-Id: Id9862712ea3e769797abd654922879ce6bc4487c
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/504976
> Reviewed-by: Ben Wagner <bungeman@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>
> Commit-Queue: John Stiles <johnstiles@google.com>
Change-Id: Ie5bae44de729aabe50c4e51ad3c7cc476fbc5dc6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/512358
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
2c70a0f96b