Add a bench to exercise legacy-mode SkRasterPipeline behavior.

No fancy f16 or sRGB here... just good old legacy 8888.

Change-Id: I21eb7c0d8e2c7a7d92e9d8a8bae9d318c4daa7e5
Reviewed-on: https://skia-review.googlesource.com/7109
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed