The goal is to make it possible to have more or less reliable way to perform performance comparisons of changes in algorithms used in dynamic topology. This change allows to run Blender with the following arguments: blender --log "sculpt.detail,pbvh.bmesh" --log-level 2 and see timing of dynamic topology flood-fill operation, as well as individual timings of edge subdivision/collapsing. Pull Request: https://projects.blender.org/blender/blender/pulls/114099