SkJumper: scales and lerps

Change-Id: I6057ba3e9243641fecbc6b78f6f83ee3265ad3d4
Reviewed-on: https://skia-review.googlesource.com/8941
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
4 files changed