shrink our 'largest' so that its non-empty

Bug: skia:
Change-Id: Ib12fd9491069440c85d5aa9c9d6d26787f03ef0d
Reviewed-on: https://skia-review.googlesource.com/92643
Reviewed-by: Yuqian Li <liyuqian@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
2 files changed