Comment 6 for bug 254857

Hm, just tried this patch in Linux and apparently it does not work (extension/internal/svg.cpp cannot see the sync-metadata.h file?).

Anyway, since this patch will ultimately just be two functions, I'd like to instead add these functions to some suitable .cpp file already existent. This will also reduce the patch size and prevent yet another object file that has to be linked. Any suggestions?