Add rotatable example and make Rotatable/Scalable conform to Stateful.

Authored by featherless on Mar 15 2017, 5:34 PM.

Description

Add rotatable example and make Rotatable/Scalable conform to Stateful.

Reviewers: O2 Material Motion, O4 Material Apple platform reviewers, Material Motion, chuga

Reviewed By: O4 Material Apple platform reviewers, chuga

Tags: Material Motion

Differential Revision: http://codereview.cc/D2884