Merge changes If1ae5505,I65e9c6ac,I1a72ca86,I417b46ed,I60f97924

* changes:
  Better support for multi call.
  Migrate RTT chat history to use proto buffer.
  Disable RTT request button when the call is not active yet.
  Use the default phone account for a voice call when the call log item is for Duo.
  Explicitly hide the badge in ContactPhotoView when it shouldn't be shown.