Add a test that draws subpictures within an MSKP and make it pass.

It would have been passing, note that he changes to SkRecorder are needed only to obtain the
SkRecord used in asseting the correct commands were recorded.

Bug: skia: 9462
Change-Id: Ic43ab400b5954cc4f6eb465168179c0204a66040
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/243818
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Nathaniel Nifong <nifong@google.com>
4 files changed