work on generation of rect, bitmap, matrix markup

TBR=caryclark@google.com
Bug: skia:6898
Change-Id: I501d87341afa2f8d548b4d02415375032a46e96e
Reviewed-on: https://skia-review.googlesource.com/47420
Reviewed-by: Cary Clark <caryclark@skia.org>
Commit-Queue: Cary Clark <caryclark@skia.org>
3 files changed