src/vs/platform/theme/common/styler.ts/attachKeybindingLabelStyler
export function attachKeybindingLabelStyler(widget: IThemable, themeService: IThemeService, style?: IKeybindingLabelStyleOverrides): IDisposable {
	return attachStyler(themeService, {
		keybindingLabelBackground: (style && style.keybindingLabelBackground) || keybindingLabelBackground,
		keybindingLabelForeground: (style && style.keybindingLabelForeground) || keybindingLabelForeground,
		keybindingLabelBorder: (style && style.keybindingLabelBorder) || keybindingLabelBorder,
		keybindingLabelBottomBorder: (style && style.keybindingLabelBottomBorder) || keybindingLabelBottomBorder,
		keybindingLabelShadow: (style && style.keybindingLabelShadow) || widgetShadow
	} as IKeybindingLabelStyleOverrides, widget);
}