fix error reporting for doc examples

Switching parts of bookmaker to use SkJSONCPP.h
introduced a couple of bugs. Fix them.

Report errors found when parsing fiddleout.json,
the results of compiling doc examples.

Parse status.json correctly for spell checking.

TBR=fmalita@chromium.org

Bug: skia:8376
Change-Id: I86d92b0613ece54495efb43424b8fca56aa2cdaf
Reviewed-on: https://skia-review.googlesource.com/154623
Reviewed-by: Cary Clark <caryclark@skia.org>
Commit-Queue: Cary Clark <caryclark@skia.org>
Auto-Submit: Cary Clark <caryclark@skia.org>
2 files changed