Avoid skvm::splat for continuous shader-dependent values

Avoids needless creation of nearly-identical programs. If someone ever
animated a two-point conical gradient, this was a disaster waiting to
happen.

Change-Id: I49008591fec703ef86eb331d7df87f3405ff15ee
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/496603
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed