src/vs/editor/common/viewLayout/viewLayout.ts/EditorScrollable/constructor
class EditorScrollable:	constructor(smoothScrollDuration: number, scheduleAtNextAnimationFrame: (callback: () => void) => IDisposable) {
		super();
		this._dimensions = new EditorScrollDimensions(0, 0, 0, 0);
		this._scrollable = this._register(new Scrollable({
			forceIntegerValues: true,
			smoothScrollDuration,
			scheduleAtNextAnimationFrame
		}));
		this.onDidScroll = this._scrollable.onScroll;
	}