tree 8ab1c5a18136c424da04509b8274e581fe1f0edc
parent 494ac35c27a0960f57b00bf8457f1956ecf149a2
author Dianne Hackborn <hackbod@google.com> 1347762828 -0700
committer Dianne Hackborn <hackbod@google.com> 1347778735 -0700

More multi-user stuff.

- New public APIs to find out when a user goes to the foreground,
  background, and is first initializing.
- New activity manager callback to be involved in the user switch
  process, allowing other services to let it know when it is safe
  to stop freezing the screen.
- Wallpaper service now implements this to handle its user switch,
  telling the activity manager when it is done.  (Currently this is
  only handling the old wallpaper going away, we need a little more
  work to correctly wait for the new wallpaper to get added.)
- Lock screen now implements the callback to do its user switch.  It
  also now locks itself when this happens, instead of relying on
  some other entity making sure it is locked.
- Pre-boot broadcasts now go to all users.
- WallpaperManager now has an API to find out if a named wallpaper is
  in use by any users.

Change-Id: I27877aef1d82126c0a1428c3d1861619ee5f8653