IndexedDB: Test for "close" event when connection is force-closed.

content/test/data/indexeddb/force_close_event.js

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function test() {
+  indexedDBTest(onUpgradeNeeded, onOpenSuccess);
+}
+
+function onUpgradeNeeded(e) {
+}
+
+function onOpenSuccess(e) {
+  // Don't let GC claim the connection
+  window.db = e.target.result;
+  window.db.onclose = onDatabaseClose;
+  document.title = 'connection ready';
+}
+
+function onDatabaseClose(e)
+{
+  document.title = 'connection closed';
+}