add bench for patchutils

Bug: skia:
Change-Id: Iba36eb5a7d09f92b7828f2ec209cbfeb8d0eb8ed
Reviewed-on: https://skia-review.googlesource.com/17601
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed