webrtc Ice Connection状态

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比较简单，为了方便记忆，直接代码：

  enum IceConnectionState {
    kIceConnectionNew,
    kIceConnectionChecking,
    kIceConnectionConnected,
    kIceConnectionCompleted,
    kIceConnectionFailed,
    kIceConnectionDisconnected,
    kIceConnectionClosed,
    kIceConnectionMax,
  };

class PeerConnectionObserver

{

...

  // Called any time the IceConnectionState changes.
  //
  // Note that our ICE states lag behind the standard slightly. The most
  // notable differences include the fact that "failed" occurs after 15
  // seconds, not 30, and this actually represents a combination ICE + DTLS
  // state, so it may be "failed" if DTLS fails while ICE succeeds.
  virtual void OnIceConnectionChange(
      PeerConnectionInterface::IceConnectionState new_state) = 0;

...

}