Implement DRM Native Pixmap using prime buffer

ui/ozone/platform/drm/BUILD.gn

 # 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.
 
 import("//build/config/linux/pkg_config.gni")
 import("//ui/ozone/ozone.gni")
 
 declare_args() {
   use_mesa_platform_null = false
   use_drm_atomic = false
 }
 
 visibility = [ "//ui/ozone/*" ]
 
 pkg_config("libdrm") {
   packages = [ "libdrm" ]
 }
 
 config("drm_atomic") {
   if (use_drm_atomic) {
     defines = [ "USE_DRM_ATOMIC" ]
   }
 }
 
 source_set("gbm") {
   sources = [
     "client_native_pixmap_factory_gbm.cc",
     "client_native_pixmap_factory_gbm.h",
+    "common/client_native_pixmap_dmabuf.cc",
+    "common/client_native_pixmap_dmabuf.h",
     "common/drm_util.cc",
     "common/drm_util.h",
     "common/scoped_drm_types.cc",
     "common/scoped_drm_types.h",
     "gpu/crtc_controller.cc",
     "gpu/crtc_controller.h",
     "gpu/drm_buffer.cc",
     "gpu/drm_buffer.h",
     "gpu/drm_console_buffer.cc",
     "gpu/drm_console_buffer.h",
@@ skipping 107 matching lines @@
 
   if (use_drm_atomic) {
     configs += [ ":drm_atomic" ]
     sources += [
       "gpu/hardware_display_plane_atomic.cc",
       "gpu/hardware_display_plane_atomic.h",
       "gpu/hardware_display_plane_manager_atomic.cc",
       "gpu/hardware_display_plane_manager_atomic.h",
     ]
   }
-
-  if (use_vgem_map) {
-    configs += [ "//ui/ozone:vgem_map" ]
-
-    sources += [
-      "common/client_native_pixmap_vgem.cc",
-      "common/client_native_pixmap_vgem.h",
-    ]
-  }
 }
 
 source_set("gbm_unittests") {
   testonly = true
   configs += [ ":drm_atomic" ]
   sources = [
     "gpu/drm_overlay_validator_unittest.cc",
     "gpu/drm_window_unittest.cc",
     "gpu/fake_plane_info.cc",
     "gpu/fake_plane_info.h",
@@ skipping 16 matching lines @@
     ":gbm",
     "//skia",
     "//testing/gtest",
     "//ui/gfx",
     "//ui/ozone:platform",
     "//ui/ozone/common",
   ]
 
   public_configs = [ ":libdrm" ]
 }