Implement DRM Native Pixmap using prime buffer

ui/ozone/platform/drm/host/drm_display_host_manager.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_DRM_HOST_DRM_DISPLAY_HOST_MANAGER_H_
 #define UI_OZONE_PLATFORM_DRM_HOST_DRM_DISPLAY_HOST_MANAGER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 88 matching lines @@
   DeviceManager* device_manager_;           // Not owned.
   InputControllerEvdev* input_controller_;  // Not owned.
 
   DrmNativeDisplayDelegate* delegate_ = nullptr;  // Not owned.
 
   // File path for the primary graphics card which is opened by default in the
   // GPU process. We'll avoid opening this in hotplug events since it will race
   // with the GPU process trying to open it and aquire DRM master.
   base::FilePath primary_graphics_card_path_;
 
-  // File path for virtual gem (VGEM) device.
-  base::FilePath vgem_card_path_;
-
   // Keeps track if there is a dummy display. This happens on initialization
   // when there is no connection to the GPU to update the displays.
   bool has_dummy_display_ = false;
 
   std::vector<scoped_ptr<DrmDisplayHost>> displays_;
 
   GetDisplaysCallback get_displays_callback_;
 
   bool display_externally_controlled_ = false;
   bool display_control_change_pending_ = false;
@@ skipping 18 matching lines @@
   scoped_ptr<DrmDeviceHandle> primary_drm_device_handle_;
 
   base::WeakPtrFactory<DrmDisplayHostManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmDisplayHostManager);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_HOST_DRM_DISPLAY_HOST_MANAGER_H_