[SVGDom] Add 'visibility' support

https://www.w3.org/TR/SVG/painting.html#VisibilityProperty

Change-Id: I8b872af26150d93cf39cf8eeba23c91e1decace3
Reviewed-on: https://skia-review.googlesource.com/58863
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
10 files changed