cacherator upscales colortables to unify caching

Bug: skia:
Change-Id: Ib63f96b83d696743bbe4335c998acd4d2ea8acdb
Reviewed-on: https://skia-review.googlesource.com/11787
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Mike Reed <reed@google.com>
4 files changed