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Note that unlike the legacy implementation, custom media items commands can be used for any media items with Media3 API. This includes `MediaItem` instances that are received from sources different to `MediaLibraryService` methods. Hence when connected against a Media3 session these custom commands can be used with a `MediaController` as well as with a `MediaBrowser`. Interoperability with `MediaBrowserServiceCompat` will be added in a follow up CL. Issue: androidx/media#1474 #cherrypick PiperOrigin-RevId: 678782860