Revert of experiment: float color components (patchset #6 id:100001 of https://codereview.chromium.org/1617813002/ )

Reason for revert:
broke some colormatrix tests

Original issue's description:
> experiment: float color components
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1617813002
>
> Committed: https://skia.googlesource.com/skia/+/353c148d8e8c9031daca34c6f9d6bcc6f08706c7

TBR=fmalita@chromium.org,mtklein@google.com,herb@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1623453002
12 files changed