[1/3] fb: Change density on the fly [UPDATE]

Change-Id: I7ee16d32ee882fea22367f49f69f4da744f3aa45

Conflicts:
	core/java/android/util/DisplayMetrics.java
	core/java/android/view/IWindowManager.aidl
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
	services/java/com/android/server/wm/WindowManagerService.java