src/vs/base/browser/ui/dropdown/dropdown.ts/DropdownMenu/constructor
class DropdownMenu:	constructor(container: HTMLElement, options: IDropdownMenuOptions) {
		super(container, options);

		this._contextMenuProvider = options.contextMenuProvider;
		this.actions = options.actions || [];
		this.actionProvider = options.actionProvider;
		this.menuClassName = options.menuClassName || '';
		this.menuAsChild = !!options.menuAsChild;
	}