Update drawimage composite benchmark to force aa

Bug: skia:
Change-Id: I3a23031cdd86d844c78134ecf79fc1ccc37ec1f1
Reviewed-on: https://skia-review.googlesource.com/c/171721
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
1 file changed