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This allows binding by track type in ChunkExtractorWrapper, which allows the EMSG and 608 tracks to be enabled on FragmentedMp4Extractor in DefaultDashChunkSource. ChunkExtractorWrapper currently binds these to DummyTrackOutputs. Note: I wanted to pass the mimeType instead, since it's a more specific, but unfortunately there's at least one place where it's not known at the point of invoking track() (FlvExtractor). Issue #2176 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=146471082