It's hard to know whether or not oop raster is enabled without printfs, since it's not on the about://gpu page.
This is currently complicated because oop raster can sometimes fail to be created even if requested. This should be considered a bug and is due to skia and chrome having different ideas about blacklists. Ideally, requesting oop raster would always turn on oop raster, which would make this a much easier task.
This is also blocked on issue 757607 , because that will likely change how the context is created.
Comment 1 by dtapu...@chromium.org
, Nov 14 2017