Revert of ozone: Remove the "drm" software composited platform

ui/ozone/platform/drm/gpu/gbm_surface_factory.cc

 // 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.
 
 #include "ui/ozone/platform/drm/gpu/gbm_surface_factory.h"
 
 #include <gbm.h>
 
 #include "base/files/file_path.h"
 #include "third_party/khronos/EGL/egl.h"
 #include "ui/ozone/common/egl_util.h"
 #include "ui/ozone/platform/drm/gpu/drm_device_manager.h"
 #include "ui/ozone/platform/drm/gpu/drm_window.h"
 #include "ui/ozone/platform/drm/gpu/gbm_buffer.h"
 #include "ui/ozone/platform/drm/gpu/gbm_device.h"
 #include "ui/ozone/platform/drm/gpu/gbm_surface.h"
 #include "ui/ozone/platform/drm/gpu/gbm_surfaceless.h"
 #include "ui/ozone/platform/drm/gpu/hardware_display_controller.h"
 #include "ui/ozone/platform/drm/gpu/screen_manager.h"
 #include "ui/ozone/public/native_pixmap.h"
 #include "ui/ozone/public/surface_ozone_canvas.h"
 #include "ui/ozone/public/surface_ozone_egl.h"
 
 namespace ui {
 
 GbmSurfaceFactory::GbmSurfaceFactory(bool allow_surfaceless)
-    : allow_surfaceless_(allow_surfaceless),
-      drm_device_manager_(nullptr),
-      screen_manager_(nullptr) {}
+    : DrmSurfaceFactory(nullptr),
+      allow_surfaceless_(allow_surfaceless),
+      drm_device_manager_(nullptr) {}
 
 GbmSurfaceFactory::~GbmSurfaceFactory() {
   DCHECK(thread_checker_.CalledOnValidThread());
 }
 
 void GbmSurfaceFactory::InitializeGpu(DrmDeviceManager* drm_device_manager,
                                       ScreenManager* screen_manager) {
   drm_device_manager_ = drm_device_manager;
   screen_manager_ = screen_manager;
 }
@@ skipping 95 matching lines @@
   return allow_surfaceless_;
 }
 
 scoped_refptr<GbmDevice> GbmSurfaceFactory::GetGbmDevice(
     gfx::AcceleratedWidget widget) {
   return static_cast<GbmDevice*>(
       drm_device_manager_->GetDrmDevice(widget).get());
 }
 
 }  // namespace ui