This is a first cut at this. More can be done and much of this is just moving what is already in the help for the commands into Doxygen comments. The documentation can be expanded to better describe the role of the various command line options. BUG= R=stichnot@chromium.org Review URL: https://codereview.chromium.org/1547743002 . Patch from Reed Kotler <rkotlerimgtec@gmail.com>.