VP8IteratorSetCountDown  434 third_party/libwebp/enc/analysis.c   VP8IteratorSetCountDown(&job->it, (end_row - start_row) * enc->mb_w_);
VP8IteratorSetCountDown   54 third_party/libwebp/enc/iterator.c   VP8IteratorSetCountDown(it, enc->mb_w_ * enc->mb_h_);  // default
VP8IteratorSetCountDown  321 third_party/libwebp/enc/vp8enci.h void VP8IteratorSetCountDown(VP8EncIterator* const it, int count_down);