ozone gbm: whitelist 3 DRM ioctl code for native GpuMemoryBuffer.

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
-
-  # TODO(dshwang): remove this flag when all gbm hardware supports vgem map.
-  # crbug.com/519587
-  use_vgem_map = false
 }
 
 pkg_config("libdrm") {
   packages = [ "libdrm" ]
 }
 
 source_set("gbm") {
   sources = [
     "common/client_native_pixmap_factory_gbm.cc",
     "common/client_native_pixmap_factory_gbm.h",
@@ skipping 111 matching lines @@
     defines += [ "USE_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) {
-    defines += [ "USE_VGEM_MAP" ]
+    configs += [ "//ui/ozone:vgem_map" ]
 
     sources += [
       "gpu/client_native_pixmap_vgem.cc",
       "gpu/client_native_pixmap_vgem.h",
     ]
   }
 }
 
 source_set("gbm_unittests") {
   testonly = true
   sources = [
     "gpu/drm_window_unittest.cc",
     "gpu/hardware_display_controller_unittest.cc",
     "gpu/hardware_display_plane_manager_unittest.cc",
     "gpu/screen_manager_unittest.cc",
     "test/mock_drm_device.cc",
     "test/mock_drm_device.h",
   ]
 
   deps = [
     "//skia",
     "//testing/gtest",
     "//ui/gfx",
     "//ui/ozone",
   ]
 
   public_configs = [ ":libdrm" ]
 }