public static function migrate( $theme_json ) {
		if ( ! isset( $theme_json['version'] ) ) {
			$theme_json = array(
				'version' => WP_Theme_JSON::LATEST_SCHEMA,
			);
		}

		if ( 1 === $theme_json['version'] ) {
			$theme_json = self::migrate_v1_to_v2( $theme_json );
		}

		return $theme_json;
	}