Fix the left/right edge swapping in isSmoothEnough

Bug: skia:7573
Change-Id: I02d863ac15c04fab39c1d7b0b8970bad484ca12c
Reviewed-on: https://skia-review.googlesource.com/104840
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
2 files changed