Enable wide color support in CCPR

Unlike other ops, always use half-float colors. The logic around the
Instance struct makes dynamically switching color size tricky.
CCPR stores color in a per-instance attribute though, so the cost of
always using FP16 is much lower.

Bug: skia:
Change-Id: I9c0c64940f74f915a18417a5830030558e065d28
Reviewed-on: https://skia-review.googlesource.com/c/182760
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
10 files changed