GADVideoControllerDelegate
@protocol GADVideoControllerDelegate <NSObject>The GADVideoControllerDelegate protocol defines methods that are called by the video controller object in response to the video events that occurred throughout the lifetime of the video rendered by an ad.
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                  Tells the delegate that the video controller has began or resumed playing a video. DeclarationSwift optional func videoControllerDidPlayVideo(_ videoController: VideoController)Objective-C - (void)videoControllerDidPlayVideo: (nonnull GADVideoController *)videoController;
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                  Tells the delegate that the video controller has paused video. DeclarationSwift optional func videoControllerDidPauseVideo(_ videoController: VideoController)Objective-C - (void)videoControllerDidPauseVideo: (nonnull GADVideoController *)videoController;
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                  Tells the delegate that the video controller’s video playback has ended. DeclarationSwift optional func videoControllerDidEndVideoPlayback(_ videoController: VideoController)Objective-C - (void)videoControllerDidEndVideoPlayback: (nonnull GADVideoController *)videoController;
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                  Tells the delegate that the video controller has muted video. DeclarationSwift optional func videoControllerDidMuteVideo(_ videoController: VideoController)Objective-C - (void)videoControllerDidMuteVideo: (nonnull GADVideoController *)videoController;
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                  Tells the delegate that the video controller has unmuted video. DeclarationSwift optional func videoControllerDidUnmuteVideo(_ videoController: VideoController)Objective-C - (void)videoControllerDidUnmuteVideo: (nonnull GADVideoController *)videoController;