Treat null profiles as sRGB

Change-Id: Id5acafa76e4590c8c0b89ba75972d0304b084a6a
Reviewed-on: https://skia-review.googlesource.com/136620
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2 files changed