ozone: Add atomic initialization path

ui/ozone/platform/drm/gpu/hardware_display_plane_manager_atomic.h

 // Copyright 2015 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_DRM_GPU_HARDWARE_DISPLAY_PLANE_MANAGER_ATOMIC_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_HARDWARE_DISPLAY_PLANE_MANAGER_ATOMIC_H_
 
 #include "ui/ozone/ozone_export.h"
 #include "ui/ozone/platform/drm/gpu/hardware_display_plane_manager.h"
 
 namespace ui {
 
 class OZONE_EXPORT HardwareDisplayPlaneManagerAtomic
     : public HardwareDisplayPlaneManager {
  public:
   HardwareDisplayPlaneManagerAtomic();
   ~HardwareDisplayPlaneManagerAtomic() override;
 
   // HardwareDisplayPlaneManager:
-  bool AssignOverlayPlanes(HardwareDisplayPlaneList* plane_list,
-                           const OverlayPlaneList& overlay_list,
-                           uint32_t crtc_id,
-                           CrtcController* crtc) override;
   bool Commit(HardwareDisplayPlaneList* plane_list, bool is_sync) 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;
 
   scoped_ptr<HardwareDisplayPlane> CreatePlane(
       uint32_t plane_id,
       uint32_t possible_crtcs) override;
 
   DISALLOW_COPY_AND_ASSIGN(HardwareDisplayPlaneManagerAtomic);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_HARDWARE_DISPLAY_PLANE_MANAGER_ATOMIC_H_