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];

			$asset_group = apply_filters( 'jetpack_perf_script_group', $registration->args, $handle );

			if ( $asset_group !== NULL ) {

				$registration->args = $asset_group;

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

			} 

		}

		global $wp_styles;

                // fetch all deps for head

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

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

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

                        $asset_group = apply_filters( 'jetpack_perf_style_group', $registration->args, $handle );

                        if ( $asset_group !== NULL ) {

                                $registration->args = $asset_group;

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

                        }

                }

	}

		// 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 );