Re-enable opList dependency tracking

Change-Id: I0fa1bbaed565a0d7de8d4475ed1d2baf200b285f
Reviewed-on: https://skia-review.googlesource.com/20700
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
4 files changed