Add AAA and DAA toggles to viewer

Bug: skia:
Change-Id: I0ee397d2b2c81a25918cb28be426cf5162da772f
Reviewed-on: https://skia-review.googlesource.com/30561
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Yuqian Li <liyuqian@google.com>
1 file changed