src/vs/base/browser/ui/progressbar/progressbar.ts/ProgressBar/constructor
class ProgressBar:	constructor(container: HTMLElement, options?: IProgressBarOptions) {
		super();

		this.workedVal = 0;

		this.showDelayedScheduler = this._register(new RunOnceScheduler(() => show(this.element), 0));
		this.longRunningScheduler = this._register(new RunOnceScheduler(() => this.infiniteLongRunning(), ProgressBar.LONG_RUNNING_INFINITE_THRESHOLD));

		this.create(container, options);
	}