[1/2] Setting for translucent statusbar on lockscreen

Change-Id: Id298c981c5c065d9d311fff8f71d140e702b4bc8

Conflicts:

	packages/SystemUI/res/layout/navigation_bar.xml
	packages/SystemUI/res/values/colors.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java