GMTCMapViewSessionDelegate
@protocol GMTCMapViewSessionDelegate <NSObject>@}
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                  A callback triggers after the session state has been updated. DeclarationSwift optional func mapViewSession(_ session: any GMTCMapViewSession, didUpdate state: GMTCMapViewSessionState)Objective-C - (void)mapViewSession:(nonnull id<GMTCMapViewSession>)session didUpdateState:(GMTCMapViewSessionState)state;