anchor.diff:   * Returns a service instance for the named Chrome Platform App. Generally
    * you'll only ever want to call this with a single name that identifies the
    * host Chrome Platform App/Extension or extension using the library. This name
  - * is used to scoped hits to your app on Google Analytics.
  + * is used to scope hits to your app on Google Analytics.
    */
   Future<GoogleAnalytics> getService(String appName) {
     if (_serviceMap[appName] != null) {
  
positive.code: 
    /**
     * Sends an Event hit to Google Analytics. [category] specifies the event
     * category. [action] specifies the event action/ [value] specifies the event
     * value; values must be non-negative.
     */
    void sendEvent(String category, String action, [String label, String value]) {
      _proxy.callMethod('sendEvent', [category, action, label, value]);
  
negative.code:    * Sends an Exception hit to Google Analytics. [description] is the exception
     * description (up to 100 chars), and [fatal] indicates whether the exception
     * was fatal.
     *
     * *Warning:* Do not send the exception message to Google Analytics as it
     * may contain personally identifiable information.
     */
    void sendException([String description, bool fatal]) {
      _proxy.callMethod('sendException', [description, fatal]);
  