DO NOT MERGE Handle child number changes after the call starts.
am: 79e1e03f08  -s ours

* commit '79e1e03f08202fca75bd0a0f6cde29d6970c4f32':
  DO NOT MERGE Handle child number changes after the call starts.
tree: c488feec0b6564a6e53b33081dd55a0e27edc44f
  1. InCallUI/