[2/2][Ozone-Drm] Scan for displays on browser size during startup

ui/ozone/platform/drm/host/drm_device_handle.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_HOST_DRM_DEVICE_HANDLE_H_
 #define UI_OZONE_PLATFORM_DRM_HOST_DRM_DEVICE_HANDLE_H_
 
 #include "base/files/scoped_file.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace ui {
 
 class DrmDeviceHandle {
  public:
   DrmDeviceHandle();
   ~DrmDeviceHandle();
 
+  int fd() const { return file_.get(); }
+
   bool Initialize(const base::FilePath& path);
 
   bool IsValid() const;
   base::ScopedFD Duplicate();
 
  private:
   base::ScopedFD file_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmDeviceHandle);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_HOST_DRM_DEVICE_HANDLE_H_