Tighten up when a line requires aa in SkGpuDevice.

For some reason this was dropping AA on horizontal/vertical lines at integers rather than half-integers.

Change-Id: I291652778d9dfc46072edcb2a557b8aea332afff
Reviewed-on: https://skia-review.googlesource.com/5633
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed