fix color management in sprite blitter

Basically exactly the same as the SkImageShader CL.

441 diffs -> 360 diffs

Change-Id: Ib0d5498d0a286a879ba39bdc28979b20881f4acb
Reviewed-on: https://skia-review.googlesource.com/140573
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed