am 0614c98e: am ddc024da: am 746ee736: Implement new video-call-related buttons.

* commit '0614c98eb532913f127098f61c632628ef481b5f':
  Implement new video-call-related buttons.
tree: 0e6e2bfb758a022b7046059ea5f48481a1dc9abf
  1. InCallUI/