add a new hsl GM

Change-Id: I2c8b9df3e6bf40de4b38966fa8ea671fc68aa45f
Reviewed-on: https://skia-review.googlesource.com/15635
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
2 files changed