Declare SkPathVerb to use uint8_t storage

It was always assumed to be this, but this formal declaration allows us
to remove lots of casts.

Change-Id: I632885f427a9520c669c82c674d891cea0d68680
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1009280
Reviewed-by: Daniel Dilan <danieldilan@google.com>
Commit-Queue: Mike Reed <mike@reedtribe.org>
Reviewed-by: Florin Malita <fmalita@google.com>
7 files changed