Add SET_WALLPAPER permission to SystemUI

If an exception is thrown in updateWallpaperLocked, a call to
WallpaperManager.clear() is made.  This requires the SET_WALLPAPER
permission and will throw a SecurityException if that permission
is not granted to SystemUI.

Change-Id: I61811b65dcfe8b15f0e9030f7aa6d1dc09cea351
Fix DocumentsUI FC

Change-Id: I2bfd4ea83db53ee83683a4754b49b15cc2abeaca
Activity chooser "Always" button is not working

When ResolverActivity is created with a custom list of matching
applications (rList) as in NFC case, and the alwaysUseOption is
set to true, the prferredActivity is not saved even if the user
presses the "always" button.

When a list is provided the variable mBaseResolveList will be
!= null. This will set mOrigResolveList = null.

When an activity is choosen and one of the buttons are pressed
onIntentSelected is called. The first thing this method does
is to check mAdapter.mOrigResolveList != null, however in this
case mOrigResolveList is always null, and the value is not
saved as PreferredActivity.

This problem was introduced in
6d8dfbd8149942f25f2b9643a12f1fb38f3be834.

Change-Id: I9eac41b7861b5e68ad3978af0dc0285f2a34eb88
Fix appwidgets not updating

Previously there was a bug where if an appwidget's update caused a
TransactionTooLargeException then the AppWidgetServiceImpl.Host's
callbacks were completely disabled, for all widgets.

The fix still allows a DeadObjectException or other RemoteException
to disable the host callbacks, as that would be caused by a bad host.

Fixes issue 28216 on the public tracker
https://code.google.com/p/android/issues/detail?id=28216

Change-Id: I5c5d5939d7211ed23cca69e6674de730b51b0f3e
Merge changes I5c5d5939,I9eac41b7,I2bfd4ea8,I61811b65 into android-4.4

* changes:
  Fix appwidgets not updating
  Activity chooser "Always" button is not working
  Fix DocumentsUI FC
  Add SET_WALLPAPER permission to SystemUI