Finish restoring GrOpList DAG

Change-Id: I2a674ce7442a444a78a53144279e88ba744eaf48
Reviewed-on: https://skia-review.googlesource.com/46462
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
3 files changed