Source

File: wp-admin/includes/plugin.php

function plugin_sandbox_scrape( $plugin ) {
	if ( ! defined( 'WP_SANDBOX_SCRAPING' ) ) {
		define( 'WP_SANDBOX_SCRAPING', true );
	}

	wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $plugin );
	include WP_PLUGIN_DIR . '/' . $plugin;
}