Import w3c tests for the service workers

third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/resources/fetch-waits-for-activate-worker.js

Index: third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/resources/fetch-waits-for-activate-worker.js
diff --git a/third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/resources/fetch-waits-for-activate-worker.js b/third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/resources/fetch-waits-for-activate-worker.js
new file mode 100644
index 0000000000000000000000000000000000000000..66f3e5936196d002f9e248677cfce7a211ded8a5
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/resources/fetch-waits-for-activate-worker.js
@@ -0,0 +1,17 @@
+var activatePromiseResolve;
+
+addEventListener('activate', function(evt) {
+  evt.waitUntil(new Promise(function(resolve) {
+    activatePromiseResolve = resolve;
+  }));
+});
+
+addEventListener('message', function(evt) {
+  if (typeof activatePromiseResolve === 'function') {
+    activatePromiseResolve();
+  }
+});
+
+addEventListener('fetch', function(evt) {
+  evt.respondWith(new Response('Hello world'));
+});