Implement GrFragmentProcessor::clone() for lighting and perlin noise classes

Change-Id: I4c6d426f170711a06d833257422092bb4b9de20c
Reviewed-on: https://skia-review.googlesource.com/26945
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2 files changed