Import wpt@a7e9c2abcf65b78fcf1c246fec6681c74e1bc352

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/request-end-to-end-worker.js

Index: third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/request-end-to-end-worker.js
diff --git a/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/request-end-to-end-worker.js b/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/request-end-to-end-worker.js
index 323c7f24367aad2e8caff3351770752a0e54f98b..dcf6feefd7d3cdd236e6eb382d4f21bb2cb3dcb5 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/request-end-to-end-worker.js
+++ b/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/request-end-to-end-worker.js
@@ -1,9 +1,20 @@
 var port = undefined;
+// Create a then-able object that is never resolved.
+function createPending() {
+  return { then: createPending };
+}
 
 onmessage = function(e) {
   var message = e.data;
   if (typeof message === 'object' && 'port' in message) {
     port = message.port;
+
+    port.postMessage('received port');
+    // The ServiceWorker which handles the "message" event must persist long
+    // enough to handle the subsequent "fetch" event. To promote test
+    // simplicity, the worker prevents its own termination indefinitely via a
+    // then-able that is never resolved.
+    e.waitUntil(createPending());
   }
 };