D29397: KPreviewJob : Support for DeviceRatioPixel

[Méven Car]

meven added a reviewer: ngraham.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D29397

To: meven, dfaure, broulik, #frameworks, ngraham
Cc: kossebau, davidedmundson, kde-frameworks-devel, LeGast00n, cblack, 
michaelh, ngraham, bruns