cache whole luma color filter

We're caching the runtime effect, but luma filter
has no uniforms, so we can cache the whole filter.

Change-Id: I7c4b37a35928b9bc804e921f99bb1eccaf13e7a5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/372294
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed