Polish of the app widgets cross-profiles feature.

1. Added API for badging an arbitrary drawable at a given location.

2. Updated the icon and previewImage deprecation as they are no longer
   returning a badged drawable. The methods to load the icon and the
   preview are now just making it easier for a developer to get the
   drawables.

3. Fixed a bug in AppWidgetServiceImpl leading to a crash when a user
   is removed.

4. Fixed a bug in AppWidgetHost which was unnecessarily caching its
   package name and having code paths where the cached value was not
   populated when calling into the system.

bug:14991269

Change-Id: I50d011a6597d88814715d5ec04ee67815e8ce0bd
8 files changed