Upstream foreign fetch tests.

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/foreign-fetch-worker.js

-self.addEventListener('install', function(event) {
-    var params = JSON.parse(decodeURIComponent(location.search.substring(1)));
-    if (!('scopes' in params)) {
-      if ('relscopes' in params) {
-        params.scopes = params.relscopes.map(s => registration.scope + s);
-      } else {
-        params.scopes = [registration.scope];
-      }
-    }
-    if (!('origins' in params))
-      params.origins = ['*'];
-    event.registerForeignFetch(params);
-  });
-
-function handle_basic(event) {
-  event.respondWith({response: new Response('Foreign Fetch'), origin: event.origin});
-}
-
-function handle_null(event) {
-  event.respondWith({response: null });
-}
-
-function handle_onmessage(event) {
-  event.respondWith({origin: event.origin, response:
-    new Response('<script>window.onmessage = e => e.ports[0].postMessage("failed");</script>',
-                 {headers: {'Content-Type': 'text/html'}})});
-}
-
-function handle_fallback(event) {
-  // Do nothing.
-}
-
-function handle_fetch(event) {
-  event.respondWith(
-    fetch(event.request).then(response => ({response, origin: event.origin})));
-}
-
-function handle_meta(event) {
-  var data = {
-    origin: event.origin,
-    referrer: event.request.referrer
-  };
-  event.respondWith({response: new Response(JSON.stringify(data)),
-                     origin: event.origin});
-}
-
-function handle_script(event) {
-  event.respondWith({origin: event.origin, response:
-    new Response('self.DidLoad("Foreign Fetch");')});
-}
-
-self.addEventListener('foreignfetch', function(event) {
-    var url = event.request.url;
-    var handlers = [
-      { pattern: '?basic', fn: handle_basic },
-      { pattern: '?null', fn: handle_null },
-      { pattern: '?fallback', fn: handle_fallback },
-      { pattern: '?fetch', fn: handle_fetch },
-      { pattern: '?onmessage', fn: handle_onmessage },
-      { pattern: '?meta', fn: handle_meta },
-      { pattern: '?script', fn: handle_script }
-    ];
-
-    var handler = null;
-    for (var i = 0; i < handlers.length; ++i) {
-      if (url.indexOf(handlers[i].pattern) != -1) {
-        handler = handlers[i];
-        break;
-      }
-    }
-
-    if (handler) {
-      handler.fn(event);
-    } else {
-      event.respondWith({origin: event.origin,
-                         response: new Response('unexpected request')});
-    }
-  });