[spec] Initial commit for web spec

Bug: skia:8999
Change-Id: Ie9f51e9e65d25fe4c1496a323af7977c81d76d98
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209380
Reviewed-by: Brian Osman <brianosman@google.com>
3 files changed