Extends the GoogleAnalyticsTracker Vaadin Add-On by additional features for privacy protection. In some countries these features are required for legal usage of GoogleAnalytics. (1) IP Anonymization Enables the "AnonymizeIP" parameter in the GA tracking. Can be disabled by setAnonymizeIp(false). If AnonymizeIP is enabled Google doesn't store the complete IP of the user. Check the GoogleAnalytics API documentation for more information about that parameter (see link section). This feature is only available when using the universal tracking mode. (2) Opt-out support Provides an opt-out option by calling the method addOptOutCookie(). It sets a cookie which disables tracking for the user.