drm: GPU process manages VGEM fd.

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

Index: ui/ozone/platform/drm/gpu/drm_device_manager.h
diff --git a/ui/ozone/platform/drm/gpu/drm_device_manager.h b/ui/ozone/platform/drm/gpu/drm_device_manager.h
index 34fe61335d62cb1bb9165d8ef3d7ea0467130f68..07d1c979ed3f24f74b736ac54bf55da69e8c298b 100644
--- a/ui/ozone/platform/drm/gpu/drm_device_manager.h
+++ b/ui/ozone/platform/drm/gpu/drm_device_manager.h
@@ -24,6 +24,7 @@ class SingleThreadTaskRunner;
 namespace ui {
 
 class DrmDevice;
+class DrmDeviceBase;
 class DrmDeviceGenerator;
 
 typedef std::vector<scoped_refptr<DrmDevice>> DrmDeviceVector;
@@ -40,6 +41,8 @@ class OZONE_EXPORT DrmDeviceManager {
   // The first device registered is assumed to be the primary device.
   bool AddDrmDevice(const base::FilePath& path, const base::FileDescriptor& fd);
   void RemoveDrmDevice(const base::FilePath& path);
+  bool AddVgemDevice(const base::FilePath& path,
+                     const base::FileDescriptor& fd);
 
   void InitializeIOTaskRunner(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
@@ -55,7 +58,9 @@ class OZONE_EXPORT DrmDeviceManager {
   // returns |primary_device_|.
   scoped_refptr<DrmDevice> GetDrmDevice(gfx::AcceleratedWidget widget);
 
-  const DrmDeviceVector& GetDrmDevices() const;
+  DrmDeviceVector GetDrmDevices() const;
+
+  scoped_refptr<DrmDeviceBase> GetVgemDevice() const;
 
  private:
   // With the exception of GetDrmDevice() all functions must be called on GPU
@@ -66,7 +71,7 @@ class OZONE_EXPORT DrmDeviceManager {
 
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
-  DrmDeviceVector devices_;
+  std::vector<scoped_refptr<DrmDeviceBase>> devices_;
 
   std::map<gfx::AcceleratedWidget, scoped_refptr<DrmDevice>> drm_device_map_;