VP8InitFilter     917 third_party/libwebp/enc/frame.c   VP8InitFilter(&it);
VP8InitFilter     988 third_party/libwebp/enc/frame.c       VP8InitFilter(&it);  // don't collect stats until last pass (too costly)
VP8InitFilter     556 third_party/libwebp/enc/vp8enci.h void VP8InitFilter(VP8EncIterator* const it);