Unify DAA and AAA usage decision

Bug: skia:
Change-Id: I2481d872e072fdd638640ef2306aa89c1a1d6d94
Reviewed-on: https://skia-review.googlesource.com/26801
Commit-Queue: Yuqian Li <liyuqian@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
2 files changed