Temporarily hide lock screen unlock targets if opening a widget

If the user selects a widget to open, it's very unlikely that they would
want to use any of the slider shortcuts at that moment. Make it easier
to unlock the screen and open the desired widget by temporarily hiding
other targets.

Change-Id: I51d879cc77826e4f7235c5d35b6352e5e83bb7cf
Themes: uninstallThemeForAllApps shouldn't check if map is empty if it's null

Potential NPE introduced in ec2200878706735cdd2caf4d934d988296998e85

Change-Id: I6d1ec165957c2be63086a18af2236e46978e9c8a
UsbDebuggingManager : Handle race condition when toggling rapidly

When toggling adb enable/disable rapidly, you can have the situation where the thread's
run() gets invoked but mAdbEnabled is already set to false, hence listenToSocket() never even
gets invoked in which case mOutputStream/mSocket are both null. This patchset adds checks
around that.

Change-Id: Iba56e7409435e22d690432fa663bc0a04a1a447d

Conflicts:
	services/java/com/android/server/usb/UsbDebuggingManager.java