chromium/chrome/test/data/extensions/api_test/page_action/popup/background.js

// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

chrome.tabs.query({active: true}, function(tabs) {
  chrome.pageAction.show(tabs[0].id);
  chrome.test.notifyPass();
});