text: chrome.app.runtime.onLaunched.addListener(function() {
    var screenWidth = screen.availWidth;
    var screenHeight = screen.availHeight;
    var width = 500;
    var height = 300;
  
    chrome.app.window.create('client.html', 
      {
        id: "mainWindowId"
      }, 
      function(window) 
      {
        window.fullscreen();
      });
  });
  