Pull path nested types out to root level

Change-Id: I66a854fa157c5c22d0caaf8bc6f5989baa876a5c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/241079
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
3 files changed