AI-generated Key Takeaways
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          GADDisplayAdMeasurement is used for measuring display custom native ad formats. 
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          The viewproperty is the ad view used to measure viewability and can be modified before or after starting measurement.
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          The startWithError:method starts OMID viewability measurement and returns whether it was successful.
GADDisplayAdMeasurement
@interface GADDisplayAdMeasurement : NSObjectMeasurement used for display custom native ad formats.
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                  Ad view used to measure viewability. This property can be modified before or after starting display ad measurement. Must be accessed on the main thread. DeclarationSwift weak var view: UIView? { get set }Objective-C @property (nonatomic, weak, nullable) UIView *view;
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                  Starts OMID viewability measurement for display ads. Returns whether OMID viewability was started and sets |error| if unable to start. Once started, all subsequent calls return YES and have no effect. Must be called on the main thread. DeclarationSwift func start() throwsObjective-C - (BOOL)startWithError:(NSError *_Nullable *_Nullable)error;