This is a reland of e2fa96ba4a
Original change's description:
> Create looping binary-search gradient colorizer.
>
> This allows us to dramatically increase the number of gradient stops
> before falling back to sampling from a texture (which smears hardstops
> and shows artifacts in extreme edge cases). The analytic colorizer
> doesn't suffer from these artifacts and blurriness effects.
>
> In nanobench, this change comes at a performance penalty for some tests:
> http://go/paste/6302350793768960
>
> The texture path might have a bit of an unfair advantage here, if the
> gradient texture can just be uploaded once and reused from the cache
> repeatedly. Presumably the setup cost of texture generation and upload
> is fairly expensive, but nanobench is testing just the steady-state
> render performance. In comparison, the analytic colorizer doesn't have
> a large setup cost.
>
> Change-Id: I71baa539a2c7f9e311ef8125de4ede2fdbf0c2d0
> Bug: skia:8401
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/457499
> Auto-Submit: John Stiles <johnstiles@google.com>
> Commit-Queue: Michael Ludwig <michaelludwig@google.com>
> Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Bug: skia:8401
Change-Id: I389f79909bc1424909481b06d70db285b55648fe
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/458277
Reviewed-by: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
c9f160b8dd