Store float and byte constant colors.

This makes loading them much simpler in 8-bit mode.

Change-Id: I35ff34ebd0b93425c4e39e055bf4ade8cf8561e1
Reviewed-on: https://skia-review.googlesource.com/30621
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
7 files changed