Reland "Update ShouldUseAAA with our better complexity estimation"

This is a reland of e847af7e0d034cb67675ad8d605d5133b6189640

This CL adds the SK_SUPPORT_LEGACY_AA_CHOICE back and it will unblock Google3 and Android.

Original change's description:
> Update ShouldUseAAA with our better complexity estimation
>
> See https://groups.google.com/forum/#!topic/skia-discuss/QrJadRQR5A4 for the issue.
>
> Bug: skia:
> Change-Id: I260d1a57f64ff7a2fc47e6bce00cd8b8dbca81a9
> Reviewed-on: https://skia-review.googlesource.com/144412
> Reviewed-by: Cary Clark <caryclark@google.com>
> Commit-Queue: Mike Klein <mtklein@google.com>

Bug: skia:
Change-Id: I18bece980b8152e7d423a328c1ebf2c61bf5d2f0
Reviewed-on: https://skia-review.googlesource.com/146220
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Yuqian Li <liyuqian@google.com>
1 file changed