Make SkSurface_Base::type() and onCapabilities() pure virtual

Change-Id: Icbbea08bd0a4bfa52e961984eff0a274814da92b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1221836
Reviewed-by: Kaylee Lubick <kjlubick@google.com>
Commit-Queue: Jorge Betancourt <jmbetancourt@google.com>
1 file changed