Don't apply coverage aa on image edges when target has msaa.

Instead use msaa.

Change-Id: Iaf72781863ea9485e9a927f1fd53cfef1ef6485d
Reviewed-on: https://skia-review.googlesource.com/94142
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
3 files changed