Make skcms_Matrix3x3 two dimensional

Change-Id: I46906594ca731ed029cedac9996d7f8da8eacf24
Reviewed-on: https://skia-review.googlesource.com/98920
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
4 files changed