iccdump .pngs if we have zlib

Change-Id: Ide5e21598563d58dc5813a09b8a6158ca7b15fdc
Reviewed-on: https://skia-review.googlesource.com/121780
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
2 files changed