WP_Customize_Background_Image_Control::enqueue

	public function enqueue() {
		parent::enqueue();

		$custom_background = get_theme_support( 'custom-background' );
		wp_localize_script(
			'customize-controls',
			'_wpCustomizeBackground',
			array(
				'defaults' => ! empty( $custom_background[0] ) ? $custom_background[0] : array(),
				'nonces'   => array(
					'add' => wp_create_nonce( 'background-add' ),
				),
			)
		);
	}