WindowServer: Add API to set/get screen layouts

This sets the stage so that DisplaySettings can configure the screen
layout and set various screen resolutions in one go. It also allows
for an easy "atomic" revert of the previous settings.

1 files changed, 4 insertions, 0 deletions

diff --git a/Userland/Libraries/LibGUI/Forward.h b/Userland/Libraries/LibGUI/Forward.h
index 156fd60b8f..a12e0e9f68 100644
--- a/Userland/Libraries/LibGUI/Forward.h
+++ b/Userland/Libraries/LibGUI/Forward.h
@@ -85,3 +85,7 @@ enum class ModelRole;
 enum class SortOrder;
 
 }
+
+namespace WindowServer {
+class ScreenLayout;
+}