Prepare ddl skp rendering for prime time

Change-Id: I87742b8ef043588c4e835ab6ec49b217dd49f829
Reviewed-on: https://skia-review.googlesource.com/114289
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
4 files changed