Use uniform arrays when setting up binary-search colorizer.
Use uniform arrays when setting up binary-search colorizer.

Previously, we used special cases with `When` and unused scratch
variables to simulate passing in a variable-length array of uniforms.
Now we can use uniform arrays directly.

Change-Id: Iadbcdeb260d1245105eb785bc901b95a6edfeeca
Bug: skia:8401
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/456928
Auto-Submit: John Stiles <f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com>
Reviewed-by: Brian Osman <794c0b5534edf5601d88e1d41975d0262da12894@google.com>
Commit-Queue: John Stiles <f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com>

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