D19907: Add Theme::blurBehindEnabled()

[David Edmundson]

davidedmundson accepted this revision.

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  addblurbehindflag

REVISION DETAIL
  https://phabricator.kde.org/D19907

To: kossebau, #plasma, davidedmundson
Cc: kde-frameworks-devel, michaelh, ngraham, bruns