src/vs/platform/theme/common/styler.ts/computeStyles
export function computeStyles(theme: IColorTheme, styleMap: IColorMapping): IComputedStyles {
	const styles = Object.create(null) as IComputedStyles;
	for (let key in styleMap) {
		const value = styleMap[key];
		if (value) {
			styles[key] = resolveColorValue(value, theme);
		}
	}

	return styles;
}