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2a524bf51f
CEA708 captions have positioning data available in their windows. However, this isn't currently translated and exposed by shaka though it is parsed from the bitstream. Translates the windows into WebVTT regions and uses the mappings outlined https://dvcs.w3.org/hg/text-tracks/raw-file/default/608toVTT/608toVTT.html#positioning-in-cea-708 This is also partially implements #2583.