Revert of Remove the AA requirement for selecting GrEffect-based clipping. (https...

Revert of Remove the AA requirement for selecting GrEffect-based clipping. (https://codereview.chromium.org/367013003/)

Reason for revert:
Assertion failing.

Original issue's description:
> Remove the AA requirement for selecting GrEffect-based clipping.
>
> Also, optionally use the scissor for a bw clip rect element instead of an effect.
>
> Committed: https://skia.googlesource.com/skia/+/a73218bbbdcbe458651d10815e8d3b73d71b8e11

R=robertphillips@google.com
TBR=robertphillips@google.com
NOTREECHECKS=true
NOTRY=true

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/369613002