scale

How far this set has been scaled from Metro's own numbers, cumulatively.

It is carried rather than recomputed because the type ramp has to scale by the same amount and lives in a different object: KvadrantTheme reads this and scales KvadrantTypography by it, so a caller cannot scale the layout and forget the text. Windows Phone had no way to get that wrong — its text was measured in the same canvas units as everything else — and neither should a caller here.