public function __construct( $theme_json = array(), $origin = 'theme' ) {
		if ( ! in_array( $origin, self::VALID_ORIGINS, true ) ) {
			$origin = 'theme';
		}

		if ( ! isset( $theme_json['version'] ) || self::LATEST_SCHEMA !== $theme_json['version'] ) {
			$this->theme_json = array();
			return;
		}

		$this->theme_json = self::sanitize( $theme_json );

		// Internally, presets are keyed by origin.
		$nodes = self::get_setting_nodes( $this->theme_json );
		foreach ( $nodes as $node ) {
			foreach ( self::PRESETS_METADATA as $preset ) {
				$path   = array_merge( $node['path'], $preset['path'] );
				$preset = _wp_array_get( $this->theme_json, $path, null );
				if ( null !== $preset ) {
					_wp_array_set( $this->theme_json, $path, array( $origin => $preset ) );
				}
			}
		}
	}