[WORK IN PROGRESS] ServiceWorkerClients.openWindow() [Blink]

LayoutTests/http/tests/serviceworker/resources/serviceworkerclients-openwindow-enumeration-worker.js

+importScripts('worker-testharness.js');
+importScripts('/resources/testharness-helpers.js');
+
+var active = new Promise(function(resolve, reject) {
+  self.addEventListener('activate', function() {
+    resolve();
+  });
+});
+
+
+// This can't be run in parallel with other successful openWindow tests.
+promise_test(function(t) {
+    function messagePromise() {
+      return new Promise(function(resolve, reject) {
+        self.onmessage = function(e) {
+          self.onmessage = null;
+          resolve(e.data);
+        };
+      });
+    }
+
+    var client_url = 'serviceworkerclients-openwindow-client.html';
+    var client;
+    var clients;
+    return active
+      .then(function() {
+        return self.clients.getAll();
+      })
+      .then(function(clients) {
+        assert_equals(clients.length, 0,
+                      'Should have no clients before opening');
+      })
+      .then(function() {
+        return self.clients.openWindow(client_url);
+      })
+      .then(function(result) {
+        client = result;
+        return self.clients.getAll();
+      })
+      .then(function(result) {
+        clients = result;
+        assert_equals(clients.length, 1,
+                      'Should have 1 client after constructing');
+        assert_equals(clients[0].url,
+                      String(new URL(client_url, self.location)),
+                      'Enumerated client URL should match');
+
+        client.postMessage('message one');
+        return messagePromise();
+      })
+      .then(function(response) {
+        assert_equals(response, 'ack: message one - 1');
+
+        clients[0].postMessage('message two');
+        return messagePromise();
+      })
+      .then(function(response) {
+        assert_equals(response, 'ack: message two - 2');
+      });
+}, 'ServiceWorkerClients openWindow() vs. getAll()');