Non linear blending flag for SkColorSpace

BUG=skia:6242

Change-Id: I63cce6019ce854ba807b2a819ef4fe3214898bee
Reviewed-on: https://skia-review.googlesource.com/8344
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Matt Sarett <msarett@google.com>
9 files changed