Make use of existing DM color space functionality

Every Sink-derived class that implements 'setColorSpace' should also implement 'colorInfo'. This CL just brings the RasterSink into compliance and uses 'colorInfo' more widely.

Change-Id: I864684c3e335583564817532f739b63642d696e4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/638976
Reviewed-by: James Godfrey-Kittle <jamesgk@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed