Squashed commit of the theme engine support.

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
	policy/src/com/android/internal/policy/impl/GlobalActions.java
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
	services/java/com/android/server/SystemServer.java
	services/java/com/android/server/UiModeManagerService.java
	services/java/com/android/server/connectivity/Tethering.java
	services/java/com/android/server/wm/WindowManagerService.java