This is a very comprehensive code sample in which:
1. Layout based on the selected print options is performed.
2. Layout work is performed only if print options change would change the content.
3. Layout result is properly reported.
4. Only requested pages are written.
5. Write result is properly reported.
6. Both Layout and write respond to cancellation.
7. Layout and render of views is demonstrated.
Change-Id: I0179b025b286f0a511cb2268da18c729c66874ba
0b73e61c6c