InCallUI: Port "Add to blacklist" support to in-call ui (1 of 2)

Change-Id: I3f9777c112a4d25499b474762f83d187782c6ca0

Conflicts:

	res/layout/call_button_fragment.xml
	src/com/android/incallui/CallButtonFragment.java
	src/com/android/incallui/CallCommandClient.java