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
SystemUI: Restore bounds when loading new gradient

This fixes an issue introduced with the reloading of the nav bar
transitions after a theme change in Change-Id: I256afc30fc018ea752769029c5246bc7310c23a6

Change-Id: I648039506b826583d554b2a0cf4f6ab9a9bb1de8
Catch all exceptions when retrieving ComposedIconInfo

It is possible to receive a TransactionTooLargeException when
getting the composed icon info from the package manager service.
We should catch these exceptions to avoid unnecessary crashes.

For reference:
The Binder transaction buffer has a limited fixed size, currently 1Mb,
which is shared by all transactions in progress for the process.
Consequently this exception can be thrown when there are many transactions
in progress even when most of the individual transactions are of moderate size.

see http://developer.android.com/reference/android/os/TransactionTooLargeException.html
for more details.

Change-Id: I70d35dc4926125bfbef5d8c5fb8ed6d6fcdbf159