[ServiceWorker] Add test for cookies of fetch() in ServiceWorker

LayoutTests/http/tests/serviceworker/resources/fetch-access-control.php

 <?php
 header('X-ServiceWorker-ServerHeader: SetInTheServer');
 if (isset($_GET['ACAOrigin'])) {
     $origins = explode(',', $_GET['ACAOrigin']);
     for ($i = 0; $i < sizeof($origins); ++$i)
         header("Access-Control-Allow-Origin: " . $origins[$i], false);
 }
 
 if (isset($_GET['ACAHeaders']))
     header("Access-Control-Allow-Headers: {$_GET['ACAHeaders']}");
 if (isset($_GET['ACAMethods']))
     header("Access-Control-Allow-Methods: {$_GET['ACAMethods']}");
 if (isset($_GET['ACACredentials']))
     header("Access-Control-Allow-Credentials: {$_GET['ACACredentials']}");
 if (isset($_GET['ACEHeaders']))
     header("Access-Control-Expose-Headers: {$_GET['ACEHeaders']}");
 
 if ((isset($_GET['Auth']) and !isset($_SERVER['PHP_AUTH_USER'])) || isset($_GET['AuthFail'])) {
     header('WWW-Authenticate: Basic realm="Restricted"');
     header('HTTP/1.0 401 Unauthorized');
     echo 'Authentication canceled';
     exit;
 }
 
 $username = 'undefined';
 $password = 'undefined';
+$cookie = 'undefined';
 if (isset($_SERVER['PHP_AUTH_USER'])) {
     $username = $_SERVER['PHP_AUTH_USER'];
 }
 if (isset($_SERVER['PHP_AUTH_PW'])) {
     $password = $_SERVER['PHP_AUTH_PW'];
 }
+if (isset($_COOKIE['cookie'])) {
+    $cookie = $_COOKIE['cookie'];
+}
 
 header('Content-Type: application/json');
 $arr = array('jsonpResult' => 'success',
              'method' => $_SERVER['REQUEST_METHOD'],
              'headers' => getallheaders(),
              'username' => $username,
-             'password' => $password);
+             'password' => $password,
+             'cookie' => $cookie);
 $json = json_encode($arr);
 echo "report( $json );";
 ?>