Material: dense variant

Material design guidelines specify two variants: normal (mobile) and dense (desktop). Citing from the documentation:

When the mouse and keyboard are the primary input methods, measurements may be condensed to accommodate denser layouts.

This affects control and font sizes. As default variant designed to be usable on mobile devices, on desktop it is quite big. I would be helpful to set something like

Material.variant: Material.Dense

and get smaller controls.

Some links with examples:
http://www.google.com/design/spec/components/lists.html#lists-specs
http://www.google.com/design/spec/layout/structure.html#structure-app-bar
http://www.google.com/design/spec/components/buttons.html#buttons-style