unorm/unorm -> to_unorm/from_unorm

Just better names, no real change.

Change-Id: I7a67ccb49d5367137b6a1f100434cb866f15ea71
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/268389
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
4 files changed