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

ui/ozone/platform/dri/hardware_display_controller.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_CONTROLLER_H_
 #define UI_OZONE_PLATFORM_DRI_HARDWARE_DISPLAY_CONTROLLER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 #include <xf86drmMode.h>
 #include <deque>
 #include <map>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
+#include "ui/ozone/ozone_export.h"
 #include "ui/ozone/platform/dri/hardware_display_plane_manager.h"
 #include "ui/ozone/platform/dri/overlay_plane.h"
 #include "ui/ozone/platform/dri/page_flip_observer.h"
 
 namespace gfx {
 class Point;
 }
 
 namespace ui {
 
@@ skipping 48 matching lines @@
 //       ^                  ^
 //       |                  |
 //      ----------------------
 //      |        CRTC1       |
 //      ----------------------
 //
 // Note that it is possible to have more connectors than CRTCs which means that
 // only a subset of connectors can be active independently, showing different
 // framebuffers. Though, in this case, it would be possible to have all
 // connectors active if some use the same CRTC to mirror the display.
-class HardwareDisplayController
+class OZONE_EXPORT HardwareDisplayController
     : public base::SupportsWeakPtr<HardwareDisplayController>,
       public PageFlipObserver {
  public:
   explicit HardwareDisplayController(scoped_ptr<CrtcController> controller);
   ~HardwareDisplayController() override;
 
   // Performs the initial CRTC configuration. If successful, it will display the
   // framebuffer for |primary| with |mode|.
   bool Modeset(const OverlayPlane& primary,
                drmModeModeInfo mode);
@@ skipping 93 matching lines @@
   drmModeModeInfo mode_;
 
   bool is_disabled_;
 
   DISALLOW_COPY_AND_ASSIGN(HardwareDisplayController);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_HARDWARE_DISPLAY_CONTROLLER_H_