bookmaker initial checkin

bookmaker is a tool that generates documentation
backends from a canonical markup. Documentation for
bookmaker itself is evolving at docs/usingBookmaker.bmh,
which is visible online at skia.org/user/api/bmh_usingBookmaker

Change-Id: Ic76ddf29134895b5c2ebfbc84603e40ff08caf09
Reviewed-on: https://skia-review.googlesource.com/28000
Commit-Queue: Cary Clark <caryclark@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
16 files changed