[Ozone-GBM] Migrate GBM buffers to use the ScanoutBuffer interface

ui/ozone/platform/dri/gbm.gypi

 # 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.
 
 {
   'variables': {
     'internal_ozone_platform_deps': [
       'ozone_platform_gbm',
     ],
     'internal_ozone_platforms': [
@@ skipping 11 matching lines @@
         '../../skia/skia.gyp:skia',
         '../base/ui_base.gyp:ui_base',
         '../events/events.gyp:events',
         '../events/ozone/events_ozone.gyp:events_ozone',
         '../gfx/gfx.gyp:gfx',
       ],
       'defines': [
         'OZONE_IMPLEMENTATION',
       ],
       'sources': [
-        'buffer_data.cc',
-        'buffer_data.h',
         'chromeos/display_message_handler.cc',
         'chromeos/display_message_handler.h',
         'chromeos/native_display_delegate_proxy.cc',
         'chromeos/native_display_delegate_proxy.h',
         'gbm_buffer.cc',
         'gbm_buffer.h',
+        'gbm_buffer_base.cc',
+        'gbm_buffer_base.h',
         'gbm_surface.cc',
         'gbm_surface.h',
         'gbm_surface_factory.cc',
         'gbm_surface_factory.h',
         'gpu_platform_support_gbm.cc',
         'gpu_platform_support_gbm.h',
         'gpu_platform_support_host_gbm.cc',
         'gpu_platform_support_host_gbm.h',
         'ozone_platform_gbm.cc',
         'ozone_platform_gbm.h',
       ],
     },
   ],
 }