text: // Copyright (c) 2015 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.
  
  chrome.runtime.onMessageExternal.addListener(
    function(request, sender, sendResponse) {
      if (sender.id != 'ceobkcclegcliomogfoeoheahogoecgl')
        return;
  
      if (request.ping)
        sendResponse({pingResponse: 'true'});
  });
  