Setup for another attempt to split up opLists

Split out of: https://skia-review.googlesource.com/c/14186 (Split up opLists (take 3))

Change-Id: Ifa600c88fb9185991d3197c7776c820f54c9bf0f
Reviewed-on: https://skia-review.googlesource.com/16540
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
16 files changed