generated SkCanvas.h

SkCanvas.h generated from docs/SkCanvas.bmh using bookmaker.

Also added corrections to SkPaint.h, and generated SkPath.h.

Once these are functionally correct (e.g., they don't break
anything) I plan to check them in -- feel free to continue
to review them before and after the check in event.

R=brianosman@google.com
TBR=reed@google.com
Bug: skia:6898
Change-Id: I6d01e9eee422304e5ab871b3870a7ed710efd645
Reviewed-on: https://skia-review.googlesource.com/30460
Commit-Queue: Cary Clark <caryclark@skia.org>
Reviewed-by: Cary Clark <caryclark@skia.org>
Reviewed-by: Yuqian Li <liyuqian@google.com>
3 files changed