Update HSL/RGB and color matrix conversion processors to use a child FP.

We are updating FPs to receive their input via a child FP where
possible, instead of relying on the input color.

Change-Id: I41cd5cba7225c7b99c656d075145588b12b49ffc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/294604
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
11 files changed