Add codec and color xform support for 565

Bug: skia:
Change-Id: I23184acc4e17d38861d27ab81172048a24c400d2
Reviewed-on: https://skia-review.googlesource.com/10288
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Matt Sarett <msarett@google.com>
9 files changed