moved to https://codereview.chromium.org/399543002/

LayoutTests/http/tests/serviceworker/resources/fetch-access-control-worker.js

+self.onmessage = function(e) {
+  var message = e.data;
+  if ('port' in message) {
+    port = message.port;
+  }
+};
+
+var baseFrameHtml =
+'<script>' +
+'function onMessage(event) {' +
+'  var frame = document.createElement(\'script\');' +
+'  frame.src = event.data.url;' +
+'  document.body.appendChild(frame);' +
+'}' +
+'function report(data) {' +
+'  window.parent.postMessage(' +
+'    data,' +
+'    \'http://127.0.0.1:8000/serviceworker/fetch-access-control.html\');' +
+'}' +
+'function onload() {' +
+'  window.addEventListener(\'message\', onMessage, false);' +
+'}' +
+'window.addEventListener(\'load\', onload);' +
+'</script>';
+
+function handleFrame(event) {
+  event.respondWith(new Response(new Blob([baseFrameHtml])));
+}
+
+function getQueryParams(url) {
+  var search = (new URL(url)).search;
+  if (!search) {
+    return {};
+  }
+  var ret = {};
+  var params = search.substring(1).split('&');
+  params.forEach(function(param) {
+    var element = param.split('=');
+    ret[decodeURIComponent(element[0])] = decodeURIComponent(element[1]);
+  });
+  return ret;
+}
+
+function getRequestInit(params) {
+  var init = {};
+  if (params['method']) {
+    init['method'] = params['method'];
+  }
+  if (params['mode']) {
+    init['mode'] = params['mode'];
+  }
+  if (params['credentials']) {
+    init['credentials'] = params['credentials'];
+  }
+  if (params['headers']) {
+    init['headers'] = JSON.parse(params['headers']);
+  }
+  return init;
+}
+
+function headersToArray(headers) {
+  var ret = [];
+  headers.forEach(function(value, key) {
+    ret.push([key, value]);
+  });
+  return ret;
+}
+
+self.addEventListener('fetch', function(event) {
+  var url = event.request.url;
+  if (event.request.url == 'http://127.0.0.1:8000/serviceworker/resources/fetch-access-control-iframe.html') {
+    handleFrame(event);
+  } else {
+    var params = getQueryParams(url);
+    var init =  getRequestInit(params);
+    event.respondWith(new Promise(function(resolve, reject) {
+      try {
+        var newRequest = new Request(event.request, init);
+        fetch(newRequest).then(function(res){
+          port.postMessage({id: params['id'],
+                            event: 'resolved',
+                            params: params,
+                            headers: headersToArray(res.headers),
+                            data: JSON.parse(JSON.stringify(res))});
+          resolve(res);
+          //resolve(new Response(new Blob(['report(\'aaa\')'])));
+        }).catch(function(e){
+          port.postMessage({id: params['id'],
+                            event: 'rejected',
+                            params: params});
+          reject();
+        });
+      } catch (e) {
+        port.postMessage({id: params['id'],
+                          event: 'error',
+                          params: params});
+        reject();
+      }
+    }));
+  }
+});