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

ui/ozone/platform/dri/hardware_display_plane_manager_legacy.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_MANAGER_ATOMIC_H_
 #define UI_OZONE_PLATFORM_DRI_HARDWARE_DISPLAY_PLANE_MANAGER_ATOMIC_H_
 
+#include "ui/ozone/ozone_export.h"
 #include "ui/ozone/platform/dri/hardware_display_plane_manager.h"
 
 namespace ui {
 
-class HardwareDisplayPlaneManagerLegacy : public HardwareDisplayPlaneManager {
+class OZONE_EXPORT HardwareDisplayPlaneManagerLegacy
+    : public HardwareDisplayPlaneManager {
  public:
   HardwareDisplayPlaneManagerLegacy();
   ~HardwareDisplayPlaneManagerLegacy() override;
 
   bool Commit(HardwareDisplayPlaneList* plane_list) override;
 
  private:
   bool SetPlaneData(HardwareDisplayPlaneList* plane_list,
                     HardwareDisplayPlane* hw_plane,
                     const OverlayPlane& overlay,
                     uint32_t crtc_id,
                     const gfx::Rect& src_rect,
                     CrtcController* crtc) override;
 
   DISALLOW_COPY_AND_ASSIGN(HardwareDisplayPlaneManagerLegacy);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_HARDWARE_DISPLAY_PLANE_MANAGER_ATOMIC_H_