Let region decoders query the type and color space

b/36905374, b/32984164
Test: CtsGraphicsTestCases

Written by: romainguy@

Change-Id: Ief4bba6ec3cd3446224199d05f06ffcffaaa72b5
Reviewed-on: https://skia-review.googlesource.com/13472
Reviewed-by: Matt Sarett <msarett@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Matt Sarett <msarett@google.com>
2 files changed