Migrate baseline transform code into a separate translation unit.

Change-Id: Ia85610ec12db4a698993824578bb2e668c10c31e
Bug: b/310927123
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/774644
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
4 files changed