chromium/chrome/test/data/extensions/api_test/lazy_background_page/on_suspend/background.js

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

chrome.runtime.onSuspend.addListener(function() {
  var now = new Date();
  chrome.storage.local.set({"last_save": now.toLocaleString()}, function() {
    console.log("Finished writing last_save: " + now.toLocaleString());
  });
});