media3/testutils
tonihei a67c73650e Add helper method to get uid of timeline period.
This removes the need to populate the entire period for the common usage of
getting the uid from the period.

Also add default implementation to get period by uid.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=205638265
2018-07-23 12:22:57 +01:00
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