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This adds the interfaces to allow for tiled monitor support via gnome-desktop. 1) add output config get/set tiled geometry/rotation support These hide under the standard APIs, and just set the state for the tiled outputs by setting the primary tile up. 2) add output config API to get primary tile 3) add tile flags to modes - add gather function to create tiled modes for primary outputs. https://bugzilla.gnome.org/show_bug.cgi?id=750311
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