kill off shader_adapter

I still plan to replace this more thoroughly with a different blitter,
but for now just implement it using callback.

This is the last stage not supported by SkJumper!  Will follow up by
removing all of SkRasterPipeline_opts.h and anything that indicates
SkJumper might not work.

Change-Id: I96ba2bb0a26266f3b658e5f3153ec7d5bbd46799
Reviewed-on: https://skia-review.googlesource.com/14037
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
3 files changed