src/vs/base/browser/browser.ts/PixelRatioFacade/_getOrCreatePixelRatioMonitor
class PixelRatioFacade:	private _getOrCreatePixelRatioMonitor(): PixelRatioImpl {
		if (!this._pixelRatioMonitor) {
			this._pixelRatioMonitor = markAsSingleton(new PixelRatioImpl());
		}
		return this._pixelRatioMonitor;
	}