src/vs/workbench/browser/part.ts/Part/constructor
class Part:	constructor(
		id: string,
		private options: IPartOptions,
		themeService: IThemeService,
		storageService: IStorageService,
		protected readonly layoutService: IWorkbenchLayoutService
	) {
		super(id, themeService, storageService);

		layoutService.registerPart(this);
	}