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(Relating to GitHub Issue #2577) The Timeline base class provides the default implementation. Timeline wrappers (e.g. ClippingTimeline, ConcatatedTimeline) forward all requests to the respective inner timelines. Some like ConcatenatedTimeline add their own additional logic to bridge between the child timelines. In addition, ConcatenatedTimeline and LoopingTimeline now have a common abstract base class as they share most of their code. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=155509269