ozone: dri: Fix undefined references in DRI platform GN build

ui/ozone/platform/dri/hardware_display_plane_manager.h

Index: ui/ozone/platform/dri/hardware_display_plane_manager.h
diff --git a/ui/ozone/platform/dri/hardware_display_plane_manager.h b/ui/ozone/platform/dri/hardware_display_plane_manager.h
index d45c7b79cd86098243c1bc3b33f9a7637bcf56be..9839b72a9967ba1f1ed9e7a1b5762532dc9d0c61 100644
--- a/ui/ozone/platform/dri/hardware_display_plane_manager.h
+++ b/ui/ozone/platform/dri/hardware_display_plane_manager.h
@@ -12,6 +12,7 @@
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_vector.h"
+#include "ui/ozone/ozone_export.h"
 #include "ui/ozone/platform/dri/hardware_display_plane.h"
 #include "ui/ozone/platform/dri/overlay_plane.h"
 #include "ui/ozone/platform/dri/scoped_drm_types.h"
@@ -27,7 +28,7 @@ class CrtcController;
 
 // This contains the list of planes controlled by one HDC on a given DRM fd.
 // It is owned by the HDC and filled by the CrtcController.
-struct HardwareDisplayPlaneList {
+struct OZONE_EXPORT HardwareDisplayPlaneList {
   HardwareDisplayPlaneList();
   ~HardwareDisplayPlaneList();
 
@@ -69,7 +70,7 @@ struct HardwareDisplayPlaneList {
   bool committed;
 };
 
-class HardwareDisplayPlaneManager {
+class OZONE_EXPORT HardwareDisplayPlaneManager {
  public:
   HardwareDisplayPlaneManager();
   virtual ~HardwareDisplayPlaneManager();