D17980: [platforms/virtual] Add support for EGL_MESA_platform_surfaceless

graesslin created this revision.
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REVISION SUMMARY
  Thus we don't require vgem any more which fails with latest mesa.
  Kepping the vgem variant as fallback for older systems. See T10245 <https://phabricator.kde.org/T10245>

TEST PLAN
  SceneOpenGL Test passes without init vgem, not tested with
  latest mesa

REPOSITORY
  R108 KWin

BRANCH
  virtual-surfaceless

REVISION DETAIL
  https://phabricator.kde.org/D17980

AFFECTED FILES
  TESTING.md
  plugins/platforms/virtual/egl_gbm_backend.cpp

To: graesslin, #kwin
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