update SkRasterPipeline::run() to also take y

y isn't used yet.  This is just a warmup that updates the callers.

Change-Id: I78f4f44e2b82f72b3a39fa8a8bdadef1d1b8a99e
Reviewed-on: https://skia-review.googlesource.com/18381
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
17 files changed