tofunmi f67569d2dd Update FrameProcessor.create() to accept an input track type.
Based on [this conversation thread](https://chat.google.com/room/AAAA--f88ao/76Rem_cRCK8), I've opted to update the existing FrameProcessor.create() rather than deprecate it, as it is unlikely to be in use by apps outside google3.

PiperOrigin-RevId: 506920930
2023-02-08 13:57:02 +00:00
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