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Add CompositeMediaSource to handle common tasks for composite media sources. · 46c4ca7d
This removes some boiler-plate code for compostite sources and will also simplify resuing media source in the future (because this class can keep track of child listeners). Issue:#3498 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=183387123
tonihei committed
