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

* commit 'ddc024da3dd38d8256dc18b2a7b5a664b93c0f27':
  Implement new video-call-related buttons.
tree: 0e6e2bfb758a022b7046059ea5f48481a1dc9abf
  1. InCallUI/