media/libraries
jbibik f0f24aa0d4 WebvttParser implementation - moved from WebvttDecoder
`WebvttDecoder` which used to be `SimpleSubtitleDecoder` will now be called `WebvttParser` and implement `SubtitleParser` interface.

For backwards compatibility, we will have the same functionality provided by `DelegatingSubtitleDecoder` backed-up by a new `WebvttParser` instance. `WebvttSubtitle` will still be used behind the scenes to handle overlapping `Cues`.

PiperOrigin-RevId: 549298733
2023-07-20 10:32:13 +01:00
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