use rasterpipeline for images if matrix is >= scale+translate

Bug: skia:
Change-Id: I36112fe54c6f2d0965d0b88f0291d7ffe0902715
Reviewed-on: https://skia-review.googlesource.com/30480
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
14 files changed