code: function handleInsertClassicBlockMedia( calypsoPort ) {
  	calypsoPort.addEventListener( 'message', onInsertClassicBlockMedia, false );
  	calypsoPort.start();
  
  	function onInsertClassicBlockMedia( message ) {
  		const action = get( message, 'data.action' );
  		if ( action !== 'insertClassicBlockMedia' ) {
  			return;
  		}
  		const editorId = get( message, 'data.payload.editorId' );
  		const media = get( message, 'data.payload.media' );
  		tinymce.editors[ editorId ].execCommand( 'mceInsertContent', false, media );
  	}
  }
docs: Listens for insert media events happening in a Media Modal opened in a Classic Block,
  and inserts the media into the appropriate block.
  
  @param {MessagePort} calypsoPort Port used for communication with parent frame.