Move makeOp to SubRun

Change-Id: Idb7fc569dabfb5626714e875eaaa97036d4f9a4a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/293343
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Herb Derby <herb@google.com>
3 files changed