The following type definitions are available globally.
A valid GADAdSize is considered to be one of the predefined GADAdSize constants or a GADAdSize constructed by GADAdSizeFromCGSize, GADAdSizeFullWidthPortraitWithHeight, GADAdSizeFullWidthLandscapeWithHeight.
Do not create a GADAdSize manually. Use one of the kGADAdSize constants. Treat GADAdSize as an opaque type. Do not access any fields directly. To obtain a concrete CGSize, use the function CGSizeFromGADAdSize().
Native ad custom click handler block. |assetID| is the ID of asset that has received a click.
typedef void (^GADNativeAdCustomClickHandler)(NSString *_Nonnull)