third_party: Add libdrm.

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_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",
@@ skipping 94 matching lines @@
     "ozone_platform_gbm.h",
   ]
 
   deps = [
     "//base",
     "//ipc",
     "//mojo/common:common_base",
     "//services/service_manager/public/cpp:sources",
     "//services/ui/public/interfaces:constants",
     "//skia",
+    "//third_party/libdrm",
     "//third_party/minigbm",
     "//ui/base",
     "//ui/display",
     "//ui/display/types",
     "//ui/display/util",
     "//ui/events",
     "//ui/events/devices",
     "//ui/events/ozone:events_ozone",
     "//ui/events/ozone:events_ozone_evdev",
     "//ui/events/ozone:events_ozone_layout",
     "//ui/events/platform",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
     "//ui/ozone:ozone_base",
     "//ui/ozone/common",
     "//ui/ozone/gl",
     "//ui/ozone/public/interfaces",
     "//ui/platform_window",
   ]
 
-  configs += [ ":libdrm" ]
-
   public_configs = [ "//third_party/khronos:khronos_headers" ]
 
   defines = [ "OZONE_IMPLEMENTATION" ]
 
   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",
@@ skipping 22 matching lines @@
     "gpu/mock_scanout_buffer.h",
     "gpu/mock_scanout_buffer_generator.cc",
     "gpu/mock_scanout_buffer_generator.h",
     "gpu/screen_manager_unittest.cc",
   ]
 
   deps = [
     ":gbm",
     "//skia",
     "//testing/gtest",
+    "//third_party/libdrm",
     "//ui/gfx",
     "//ui/ozone:platform",
     "//ui/ozone/common",
   ]
-
-  public_configs = [ ":libdrm" ]
 }