Code review remark: `viewportNewSize` is available as a param here. The `_onViewportResized` function is called from indirectly from here https://github.com/ariatemplates/ariatemplates/blob/master/src/aria/templates/Layout.js#L141 and the only direct call is the one below in L864. In both cases, the function gets `{viewportNewSize : ...}` as a param, so it's safe to do this change.