warmup learning sksl interpreter

Do some TODOs.

I have no idea what I am doing with align()... just following what
appears to be the pattern without understanding what it does.

Change-Id: I1b15240e037769efdacb399992cac1786101cd0f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/214329
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed