src/vs/workbench/browser/parts/compositeBar.ts/CompositeBar/constructor
class CompositeBar:	constructor(
		items: ICompositeBarItem[],
		private readonly options: ICompositeBarOptions,
		@IInstantiationService private readonly instantiationService: IInstantiationService,
		@IContextMenuService private readonly contextMenuService: IContextMenuService
	) {
		super();

		this.model = new CompositeBarModel(items, options);
		this.visibleComposites = [];
		this.compositeSizeInBar = new Map<string, number>();
		this.computeSizes(this.model.visibleItems);
	}