FilterInstance    310 skia/ext/convolver.cc   FilterInstance instance;
FilterInstance    327 skia/ext/convolver.cc   const FilterInstance& filter = filters_[0];
FilterInstance    105 skia/ext/convolver.h     const FilterInstance& filter = filters_[value_offset];
FilterInstance    156 skia/ext/convolver.h   std::vector<FilterInstance> filters_;