D26171: Implement wp_viewporter

[Roman Gilg]

romangg added a dependent revision: D26172: Add wp_viewporter support.

REPOSITORY
  R127 KWayland

REVISION DETAIL
  https://phabricator.kde.org/D26171

To: romangg, #kwin
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns