media3/libraries
tonihei f7af58951d Allow signed TTML region origins
The origin may be negative if the subtitle starts off-screen
but extends into the screen for example.

TTML1 defines `tts:origin` in terms of
[`length`](https://www.w3.org/TR/2018/REC-ttml1-20181108/#style-value-length),
which allows a prefix of `+`, `-` or nothing, and it's the
[same in TTML2](https://www.w3.org/TR/2018/REC-ttml2-20181108/#style-value-length).

PiperOrigin-RevId: 682379845
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