ozone/platform/wayland: Add support for wl_output_interface

ui/ozone/platform/wayland/wayland_display.h

Index: ui/ozone/platform/wayland/wayland_display.h
diff --git a/ui/ozone/platform/wayland/wayland_display.h b/ui/ozone/platform/wayland/wayland_display.h
index d63945a8a69050d9af00fc92489600ac0ddede6b..cb1823859769997d1fb245e58de935b26d7cc993 100644
--- a/ui/ozone/platform/wayland/wayland_display.h
+++ b/ui/ozone/platform/wayland/wayland_display.h
@@ -12,6 +12,7 @@
 #include "ui/gfx/native_widget_types.h"
 #include "ui/ozone/platform/wayland/wayland_object.h"
 #include "ui/ozone/platform/wayland/wayland_pointer.h"
+#include "ui/ozone/platform/wayland/wayland_screen.h"
 
 namespace ui {
 
@@ -38,6 +39,9 @@ class WaylandDisplay : public PlatformEventSource,
   void AddWindow(gfx::AcceleratedWidget widget, WaylandWindow* window);
   void RemoveWindow(gfx::AcceleratedWidget widget);
 
+  const std::vector<WaylandScreen*>& GetScreenList() const;
+  WaylandScreen* PrimaryScreen() const;
+
  private:
   void Flush();
   void DispatchUiEvent(Event* event);
@@ -65,6 +69,7 @@ class WaylandDisplay : public PlatformEventSource,
   static void Ping(void* data, xdg_shell* shell, uint32_t serial);
 
   std::map<gfx::AcceleratedWidget, WaylandWindow*> window_map_;
+  static WaylandDisplay* instance_;
 
   wl::Object<wl_display> display_;
   wl::Object<wl_registry> registry_;
@@ -79,6 +84,8 @@ class WaylandDisplay : public PlatformEventSource,
   bool watching_ = false;
   base::MessagePumpLibevent::FileDescriptorWatcher controller_;
 
+  std::vector<WaylandScreen*> screen_list_;
+
   DISALLOW_COPY_AND_ASSIGN(WaylandDisplay);
 };