refactor for saner constness

Change-Id: I657ebb580c325f3cfdbf7dad7a0c1f0a118e3769
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/202725
Auto-Submit: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed