src/vs/workbench/contrib/notebook/browser/contrib/cellStatusBar/executionStatusBarItemController.ts/TimerCellStatusBarContrib/constructor
class TimerCellStatusBarContrib:	constructor(notebookEditor: INotebookEditor) {
		super();
		this._register(new NotebookStatusBarController(notebookEditor, (vm, cell) => new TimerCellStatusBarItem(vm, cell)));
	}