drm: GPU process manages VGEM fd.

ui/ozone/platform/drm/host/drm_device_handle.h

Index: ui/ozone/platform/drm/host/drm_device_handle.h
diff --git a/ui/ozone/platform/drm/host/drm_device_handle.h b/ui/ozone/platform/drm/host/drm_device_handle.h
index a6affc3777954bebf514f5d739cd9774b3275d8d..622b9ec3a255e94c353a42b3c1bde7cc16d8a2d6 100644
--- a/ui/ozone/platform/drm/host/drm_device_handle.h
+++ b/ui/ozone/platform/drm/host/drm_device_handle.h
@@ -18,13 +18,15 @@ class DrmDeviceHandle {
   DrmDeviceHandle();
   ~DrmDeviceHandle();
 
-  bool Initialize(const base::FilePath& path);
+  bool Initialize(const base::FilePath& path, bool is_vgem);
 
   bool IsValid() const;
   base::ScopedFD Duplicate();
+  bool IsVgem() const { return is_vgem_; }
 
  private:
   base::ScopedFD file_;
+  bool is_vgem_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmDeviceHandle);
 };