Automattic / jetpack

		// fetch all deps for head

		$wp_scripts->all_deps( $wp_scripts->queue, true, 1 );

		foreach( $wp_scripts->to_do as $handle ) {

			$registration = $wp_scripts->registered[$handle];

			if ( $registration->args !== NULL ) {

				// skip, this asset has an explicit location

				continue;

			}

			$asset_group = apply_filters( 'jetpack_perf_asset_group', 1, $handle );

			$registration->args = $asset_group;

			$wp_scripts->groups[$handle] = $asset_group;

		}

	}

	function set_asset_groups( $group, $handle ) {

		// resolve asset dependencies and capture URLs

		global $wp_scripts;

		$wp_scripts->all_deps( $wp_scripts->queue, true );

		foreach( $wp_scripts->to_do as $handle ) {

			$registration = $wp_scripts->registered[$handle];

			$url = apply_filters( 'script_loader_src', $registration->src, $handle );

			if ( $registration->ver ) {

				$url = add_query_arg( 'ver', $registration->ver, $url );

			}

			$asset_urls[] = $url;

		}

		global $wp_styles;

		$wp_styles->all_deps( $wp_styles->queue, true );