private String getIceConnectionStateScript() {
    return "var retValue;"
      + "try {retValue = appController.call_.pcClient_.pc_.iceConnectionState;} catch (exception) {} "
      + "if (retValue) {return retValue;} else {return 'unknown';}";
  }
Returns the test JavaScript to retrieve appController.call_.pcClient_.pc_.iceConnectionState.
If it doesn't exist then the method returns 'unknown'.

@return the getIceConnectionStateScript as string.
KITE-AppRTC-Test/src/main/java/org/webrtc/kite/apprtc/pages/AppRTCMeetingPage.java