public GADAdSizeDelegateSizeEventArgs(GoogleAdMobAds.GADAdSize size)
 {
     this.Size = size;
 }
            public override void WillChangeAdSizeTo(GoogleAdMobAds.GADBannerView view, GoogleAdMobAds.GADAdSize size)
            {
                EventHandler <GADAdSizeDelegateSizeEventArgs> handler = willChangeAdSizeTo;

                if (handler != null)
                {
                    var args = new GADAdSizeDelegateSizeEventArgs(size);
                    handler(view, args);
                }
            }