wp_admin_bar_appearance_menu( WP_Admin_Bar $wp_admin_bar )

function wp_admin_bar_appearance_menu( $wp_admin_bar ) {
	$wp_admin_bar->add_group( array( 'parent' => 'site-name', 'id' => 'appearance' ) );

	if ( current_user_can( 'switch_themes' ) ) {
		$wp_admin_bar->add_menu( array(
			'parent' => 'appearance',
			'id'     => 'themes',
			'title'  => __( 'Themes' ),
			'href'   => admin_url( 'themes.php' ),
		) );
	}

	if ( ! current_user_can( 'edit_theme_options' ) ) {
		return;
	}

	if ( current_theme_supports( 'widgets' )  ) {
		$wp_admin_bar->add_menu( array(
			'parent' => 'appearance',
			'id'     => 'widgets',
			'title'  => __( 'Widgets' ),
			'href'   => admin_url( 'widgets.php' ),
		) );
	}

	if ( current_theme_supports( 'menus' ) || current_theme_supports( 'widgets' ) )
		$wp_admin_bar->add_menu( array( 'parent' => 'appearance', 'id' => 'menus', 'title' => __('Menus'), 'href' => admin_url('nav-menus.php') ) );

	if ( current_theme_supports( 'custom-background' ) ) {
		$wp_admin_bar->add_menu( array(
			'parent' => 'appearance',
			'id'     => 'background',
			'title'  => __( 'Background' ),
			'href'   => admin_url( 'themes.php?page=custom-background' ),
			'meta'   => array(
				'class' => 'hide-if-customize',
			),
		) );
	}

	if ( current_theme_supports( 'custom-header' ) ) {
		$wp_admin_bar->add_menu( array(
			'parent' => 'appearance',
			'id'     => 'header',
			'title'  => __( 'Header' ),
			'href'   => admin_url( 'themes.php?page=custom-header' ),
			'meta'   => array(
				'class' => 'hide-if-customize',
			),
		) );
	}

}