Import w3c tests for the service workers

third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/resources/navigate-window-worker.js

+addEventListener('message', function(evt) {
+  if (evt.data.type === 'GET_CLIENTS') {
+    clients.matchAll(evt.data.opts).then(function(clientList) {
+      var resultList = clientList.map(function(c) {
+        return { url: c.url, frameType: c.frameType, id: c.id };
+      });
+      evt.source.postMessage({ type: 'success', detail: resultList });
+    }).catch(function(err) {
+      evt.source.postMessage({
+        type: 'failure',
+        detail: 'matchAll() rejected with "' + err + '"'
+      });
+    });
+    return;
+  }
+
+  evt.source.postMessage({
+    type: 'failure',
+    detail: 'Unexpected message type "' + evt.data.type + '"'
+  });
+});