tonihei 04baa42349 Add custom callbacks to allows seeks after dynamic playlist modifications.
These callbacks are executed on the app thread after the corresponding
timeline update was triggered. This ensures that seek operations see the
updated timelines and are therefore valid, even if the seek is performed into a
window which didn't exist before.

GitHub:#3407

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=175136187
2017-11-13 15:10:56 +00:00
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