Upstream service worker "update" tests to WPT

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/update-worker.php

-<?php
-if(!isset($_COOKIE['mode']))
-  $mode = 'init'; // Set mode to 'init' for initial fetch.
-else
-  $mode = $_COOKIE['mode']; // $_COOKIE['mode'] is either 'normal' or 'error'.
-
-// no-cache itself to ensure the user agent finds a new version for each update.
-header("Cache-Control: no-cache, must-revalidate");
-header("Pragma: no-cache");
-
-$extra_body = '';
-
-if ($mode == 'init') {
-  // Set a normal mimetype.
-  // Set cookie value to 'normal' so the next fetch will work in 'normal' mode.
-  header('Content-Type:application/javascript');
-  setcookie('mode', 'normal');
-} else if ($mode == 'normal') {
-  // Set a normal mimetype.
-  // Set cookie value to 'error' so the next fetch will work in 'error' mode.
-  header('Content-Type:application/javascript');
-  setcookie('mode', 'error');
-} else if ($mode == 'error') {
-  // Set a disallowed mimetype.
-  // Set cookie value to 'syntax-error' so the next fetch will work in 'syntax-error' mode.
-  header('Content-Type:text/html');
-  setcookie('mode', 'syntax-error');
-} else if ($mode == 'syntax-error') {
-  // Set cookie value to 'throw-install' so the next fetch will work in 'throw-install' mode.
-  header('Content-Type:application/javascript');
-  setcookie('mode', 'throw-install');
-  $extra_body = 'badsyntax(isbad;';
-} else if ($mode == 'throw-install') {
-  // Unset and delete cookie to clean up the test setting.
-  header('Content-Type:application/javascript');
-  unset($_COOKIE['mode']);
-  setcookie('mode', '', time() - 3600);
-  $extra_body = "addEventListener('install', function(e) { throw new Error('boom'); });";
-}
-// Return a different script for each access.
-echo '/* ', microtime(), ' */ ', $extra_body;
-?>