bachinger e5ec6b31b2 Store adPlaybackStates and shared periods by period UID
To support multi-period content we need to store AdPlaybackStates and
SharedMediaPeriod by the periodUid as a key. While after this no-op CL,
we still only support single-period content, storing these resources by
periodUid is the ground work for multi-period support being added in an
follow-up CL.

PiperOrigin-RevId: 416836445
2021-12-20 13:52:46 +00:00
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