Add cairo interface.

src/windows/ui_interfaces/x11/XcbScreen.cpp

@@ -0,0 +1,29 @@
+#include "XcbScreen.h"
+
+#include <xcb/xcb.h>
+
+XcbScreen::XcbScreen(xcb_screen_t* screen)
+    : mNativeScreen(screen)
+{
+
+}
+
+std::unique_ptr<XcbScreen> XcbScreen::Create(xcb_screen_t* screen)
+{
+    return std::make_unique<XcbScreen>(screen);
+}
+
+xcb_screen_t* XcbScreen::GetNativeScreen() const
+{
+    return mNativeScreen;
+}
+
+void XcbScreen::SetGraphicsContext(unsigned gc)
+{
+    mGraphicsContext = gc;
+}
+
+unsigned XcbScreen::GetGraphicsContext() const
+{
+    return mGraphicsContext;
+}