Add an option in the InCall UI to perform call recording

Change-Id: Icc86a0a7ae9d2493a837d02f321df7cb1387cded

Conflicts:
	res/layout/call_button_fragment.xml
	res/values/colors.xml
	src/com/android/incallui/CallButtonFragment.java
	src/com/android/incallui/CallRecordingButton.java