Add ACTION_PAGE_UP/DOWN/NEXT/PREVIOUS

This not only indicates if something is paged, it also indicates what
direction a page can be scrolled towards.

Test: The API Builds, there is no executable code here, that is for
another CL
Bug: 119425427

Change-Id: I0a40079f4e31e48bc53445a247e301c0d09d2497
4 files changed