AV1 input buffers contain multiple compressed pictures.
Enable skipping only the last showable frame, while leaving
any reference pictures to be decoded later, as part of
the next decoder input buffer.
Partial skipping of AV1 input buffer is only applied when:
* fewer than 8 OBUs are delayed
* there's likely to be enough capacity in the decoder input buffer
for the next frame
PiperOrigin-RevId: 723496060
a80e7be029