void Start()
 {
     //This call will be ignored of you already have GoogleAnalytics gameobject on your scene, like in the example scene
     //However if you do not want to create additional object in your initial scene
     //you may use this code to initialize analytics
     //WARNING: if you do not have GoogleAnalytics gamobect and you skip StartTracking call, GoogleAnalytics gameobect will be
     //initialized on first GoogleAnalytics.Client call
     GoogleAnalytics.StartTracking();
 }