[8/8][Ozone-Dri] Pass DRM FD to GPU process on hotplug event

ui/ozone/platform/dri/native_display_delegate_dri.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_NATIVE_DISPLAY_DELEGATE_DRI_H_
 #define UI_OZONE_PLATFORM_DRI_NATIVE_DISPLAY_DELEGATE_DRI_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "ui/ozone/common/gpu/ozone_gpu_message_params.h"
 
 namespace base {
+class FileDescriptor;
 class FilePath;
 class SingleThreadTaskRunner;
 }
 
 namespace ui {
 
 class DeviceManager;
 class DisplaySnapshotDri;
 class DisplayMode;
 class DisplayModeDri;
 class DriWrapper;
+class DrmDeviceGenerator;
 class ScreenManager;
 
 class NativeDisplayDelegateDri {
  public:
   NativeDisplayDelegateDri(ScreenManager* screen_manager,
-                           const scoped_refptr<DriWrapper>& primary_device);
+                           const scoped_refptr<DriWrapper>& primary_device,
+                           scoped_ptr<DrmDeviceGenerator> device_generator);
   ~NativeDisplayDelegateDri();
 
   void InitializeIOTaskRunner(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
 
   void ForceDPMSOn();
 
   // Returns a list of the connected displays. When this is called the list of
   // displays is refreshed.
   std::vector<DisplaySnapshot_Params> GetDisplays();
 
   bool ConfigureDisplay(int64_t id,
                         const DisplayMode_Params& mode,
                         const gfx::Point& origin);
   bool DisableDisplay(int64_t id);
 
   // Takes/releases the control of the DRM devices.
   bool TakeDisplayControl();
   bool RelinquishDisplayControl();
 
   // Called on DRM hotplug events to add/remove a DRM device.
-  void AddGraphicsDevice(const base::FilePath& path);
+  void AddGraphicsDevice(const base::FilePath& path,
+                         const base::FileDescriptor& fd);
   void RemoveGraphicsDevice(const base::FilePath& path);
 
  private:
   DisplaySnapshotDri* FindDisplaySnapshot(int64_t id);
   const DisplayModeDri* FindDisplayMode(const gfx::Size& size,
                                         bool is_interlaced,
                                         float refresh_rate);
 
   void RefreshDisplayList();
   bool Configure(const DisplaySnapshotDri& output,
                  const DisplayModeDri* mode,
                  const gfx::Point& origin);
 
   bool GetHDCPState(const DisplaySnapshotDri& output, HDCPState* state);
   bool SetHDCPState(const DisplaySnapshotDri& output, HDCPState state);
 
   // Notify ScreenManager of all the displays that were present before the
   // update but are gone after the update.
   void NotifyScreenManager(
       const std::vector<DisplaySnapshotDri*>& new_displays,
       const std::vector<DisplaySnapshotDri*>& old_displays) const;
 
   ScreenManager* screen_manager_;  // Not owned.
+  scoped_ptr<DrmDeviceGenerator> drm_device_generator_;
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
   std::vector<scoped_refptr<DriWrapper>> devices_;
   // Modes can be shared between different displays, so we need to keep track
   // of them independently for cleanup.
   ScopedVector<const DisplayMode> cached_modes_;
   ScopedVector<DisplaySnapshotDri> cached_displays_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeDisplayDelegateDri);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_NATIVE_DISPLAY_DELEGATE_DRI_H_