Add SkNWayCanvas comment API overrides.

SkNWayCanvas should also dispatch beginCommentGroup(), addComment() & endCommentGroup.

R=robertphillips@google.com

Author: fmalita@chromium.org

Review URL: https://chromiumcodereview.appspot.com/19723012

git-svn-id: http://skia.googlecode.com/svn/trunk@10224 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed