bachinger d7280f096f Add custom cache key to media item
This is required to migrate the PlayerActivity away from Sample to MediaItem. It hence needs adding buildUpon to MediaItem to mix in the customCacheKey and streamKeys before playback.

PiperOrigin-RevId: 306710643
2020-04-17 10:44:16 +01:00
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2020-04-17 10:44:16 +01:00
2020-04-17 10:44:16 +01:00