hard-roll skcms into Skia

Adding roll.sh to make it easy.

Change-Id: I7887c5f9a41c5b68a5dec89ebc8ac86a1707fef6
Reviewed-on: https://skia-review.googlesource.com/120120
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
20 files changed