andrewlewis 675756d32d Create MediaPeriods based on an identifier not an index
This will allow MediaSources to provide MediaPeriods that correspond to ad
breaks in a timeline period rather than content for a timeline period, in a
future change.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=160267841
2017-06-28 22:26:05 +01:00
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