code: boolean prefetchGAdsParams(Context context, GAdsParamsFetchEvents callback) {
          boolean isPrefetchStarted = false;
          if (TextUtils.isEmpty(GAIDString_)) {
              isPrefetchStarted = true;
              new GAdsPrefetchTask(context, callback).executeTask();
          }
          return isPrefetchStarted;
      }
docs: Method to prefetch the GAID and LAT values.
  
  @param context Context.
  @param callback {@link GAdsParamsFetchEvents} instance to notify process completion
  @return {@link Boolean} with true if GAID fetch process started.