We should draw at least once for benchmark

Bug: skia:6792
Change-Id: Ia69c7601abead8f30963de709f22e27e04798319
Reviewed-on: https://skia-review.googlesource.com/20697
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
1 file changed