src/vs/workbench/contrib/notebook/browser/services/notebookWorkerServiceImpl.ts/WorkerManager/withWorker
class WorkerManager:	withWorker(): Promise<NotebookWorkerClient> {
		// this._lastWorkerUsedTime = (new Date()).getTime();
		if (!this._editorWorkerClient) {
			this._editorWorkerClient = new NotebookWorkerClient(this._notebookService, 'notebookEditorWorkerService');
		}
		return Promise.resolve(this._editorWorkerClient);
	}