code: function checkMediaFlowState(key, value)
  {
    if(typeof value != 'string')
      throw SyntaxError(key+' param should be a String, not '+typeof value);
  
    if(!value.match('FLOWING|NOT_FLOWING'))
      throw SyntaxError(key+' param is not one of [FLOWING|NOT_FLOWING] ('+value+')');
  }
docs: Flowing state of the media.
  
  @typedef core/complexTypes.MediaFlowState
  
  @type {(FLOWING|NOT_FLOWING)}
   
  Checker for {@link module:core/complexTypes.MediaFlowState}
  
  @memberof module:core/complexTypes
  
  @param {external:String} key
  @param {module:core/complexTypes.MediaFlowState} value