Merge "Auto downgrade emergency video call to audio-only if not supported." into nyc-dev
am: 17cc3d0

* commit '17cc3d09c3fc849fbd80e853a5ef124fd5ffba69':
  Auto downgrade emergency video call to audio-only if not supported.

Change-Id: Id6531620e7b604c78cac1410d03b5d39252e4150