Enable DAA in the init-once phase of threaded backends

Bug: skia:
Change-Id: Idb856fe12f0f9fa1014e7d15ef40bd7b456634d6
Reviewed-on: https://skia-review.googlesource.com/107540
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
4 files changed