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

ui/ozone/platform/dri/hardware_display_plane.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_OZONE_PLATFORM_DRI_HARDWARE_DISPLAY_PLANE_H_
 #define UI_OZONE_PLATFORM_DRI_HARDWARE_DISPLAY_PLANE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/basictypes.h"
+#include "ui/ozone/ozone_export.h"
 #include "ui/ozone/platform/dri/scoped_drm_types.h"
 
 namespace gfx {
 class Rect;
 }
 
 namespace ui {
 
 class DriWrapper;
 
-class HardwareDisplayPlane {
+class OZONE_EXPORT HardwareDisplayPlane {
  public:
   HardwareDisplayPlane(ScopedDrmPlanePtr plane);
   HardwareDisplayPlane(uint32_t plane_id, uint32_t possible_crtcs);
 
   virtual ~HardwareDisplayPlane();
 
   bool Initialize(DriWrapper* drm);
 
   bool CanUseForCrtc(uint32_t crtc_index);
 
@@ skipping 10 matching lines @@
   uint32_t possible_crtcs_;
   uint32_t owning_crtc_;
   bool in_use_;
 
   DISALLOW_COPY_AND_ASSIGN(HardwareDisplayPlane);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_HARDWARE_DISPLAY_PLANE_H_