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

Change-Id: I7ee16d32ee882fea22367f49f69f4da744f3aa45

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
        policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java