reland fix picture subclass destructor doc

Failure to fully parse subclass destructor
caused bookmaker to drop everything that
followed. Fix it, and look for subclass
constructors more thoroughly.

Fixed ints that should have been size_t
that broke the build the first time. Its
weird that the trybot CL didn't catch this.

TBR=caryclark@google.com

Docs-Preview: https://skia.org/?cl=152666
Bug: skia:6898
Change-Id: Id2ec0e96e71c371c97f344f9e116be211fd220bc
Reviewed-on: https://skia-review.googlesource.com/152666
Commit-Queue: Cary Clark <caryclark@google.com>
Auto-Submit: Cary Clark <caryclark@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
6 files changed