src/vs/editor/standalone/browser/standaloneThemeServiceImpl.ts/StandaloneTheme/getColor
class StandaloneTheme:	public getColor(colorId: ColorIdentifier, useDefault?: boolean): Color | undefined {
		const color = this.getColors().get(colorId);
		if (color) {
			return color;
		}
		if (useDefault !== false) {
			return this.getDefault(colorId);
		}
		return undefined;
	}