@protocol GADMediatedNativeAd <NSObject>
Base protocol for mediated native ads.
Returns a delegate object that receives state change notifications.
- (nullable id<GADMediatedNativeAdDelegate>)mediatedNativeAdDelegate;
Returns a dictionary of asset names and object pairs for assets that are not handled by properties of the GADMediatedNativeAd subclass.
- (nullable NSDictionary *)extraAssets;