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This behavior was previously available as opt-in via `MediaItem.DrmConfiguration.Builder.setPlayClearContentWithoutKey` and `DefaultDrmSessionManager.Builder.setPlayClearSamplesWithoutKeys`. This change flips the default of both these properties to true. This should speed up the time for playback to start when playing DRM content with a 'clear lead' of unencrypted samples at the start. Previously playback would wait until the keys for the later encrypted samples were ready. The new behaviour could result in mid-playback stalls/rebuffers if the keys are not ready yet by the transition from clear to encrypted samples, but this is not really a regression since previously playback wouldn't have started at all at this point. PiperOrigin-RevId: 595992727