SetChunk          978 third_party/libwebp/demux/demux.c   return SetChunk(fourcc, chunk_num, iter);
SetChunk          985 third_party/libwebp/demux/demux.c     return SetChunk(fourcc, iter->chunk_num + 1, iter);
SetChunk          994 third_party/libwebp/demux/demux.c     return SetChunk(fourcc, iter->chunk_num - 1, iter);