Upstream foreign fetch tests.

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/foreign-fetch-cors-worker.js

-importScripts('../../resources/get-host-info.js');
+importScripts('get-host-info.sub.js');
 var host_info = get_host_info();
 
 self.addEventListener('install', function(event) {
     event.registerForeignFetch({scopes: [registration.scope], origins: ['*']});
   });
 
 self.addEventListener('foreignfetch', function(event) {
     var response = JSON.parse(decodeURIComponent(location.search.substring(1)));
     var url = new URL(event.request.url);
     var params = JSON.parse(decodeURIComponent(url.search.substring(1)));
-    var url_to_fetch = 'fetch-access-control.php?';
+    var url_to_fetch = 'fetch-access-control.py?';
     if (params.cross_origin) {
       url_to_fetch =
-          host_info.HTTPS_ORIGIN + '/serviceworker/resources/' + url_to_fetch;
+          host_info.HTTPS_ORIGIN + new URL('./', location).pathname + url_to_fetch;
     }
     if (params.with_aceheaders)
       url_to_fetch += 'ACEHeaders=X-ServiceWorker-ServerHeader&';
     if (params.with_acaorigin)
       url_to_fetch += 'ACAOrigin=*';
     fetch_params = {};
     if (params.cross_origin && !params.with_acaorigin)
        fetch_params.mode = 'no-cors';
     event.respondWith(fetch(url_to_fetch, fetch_params)
       .then(r => {
           response.response = r;
           return response;
         }));
     return;
   });