font-lock-default-fontify-region
font-lock-default-fontify-region is a compiled Lisp function in `font-lock.el
'.
(font-lock-default-fontify-region BEG END LOUDLY)
Fontify the text between BEG and END.
If LOUDLY is non-nil, print status messages while fontifying.
This function is the default `font-lock-fontify-region-function'.