Tell IDB frontend about data loss

content/test/data/indexeddb/open_bad_db.js

 // Copyright (c) 2012 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() {
   request = webkitIndexedDB.open('database-basics');
   request.onupgradeneeded = upgradeNeeded;
   request.onsuccess = onSuccess;
   request.onerror = unexpectedErrorCallback;
   request.onblocked = unexpectedBlockedCallback;
 }
 
 var gotUpgradeNeeded = false;
-function upgradeNeeded() {
+function upgradeNeeded(evt) {
+  event = evt;
+  shouldBe("event.dataLoss", "'total'");
   gotUpgradeNeeded = true;
 }
 
 function onSuccess(event) {
   db = event.target.result;
   debug("The pre-existing leveldb has an objectStore in 'database-basics',");
   debug("ensure that it was blown away");
   shouldBe("db.objectStoreNames.length", "0");
   debug("We should have gotten an upgradeneeded event because the new empty");
   debug("database doesn't have a version.");
   shouldBeTrue("gotUpgradeNeeded");
   done();
 }