add some ideas as TODOs

Change-Id: I5c89d5760c16097d658c454950a6632bd427c6ab
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/228637
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed