Add GN Build file for ui/events/ozone.

ui/gfx/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/ui.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
@@ skipping 306 matching lines @@
       "platform_font_ozone.cc",
       "ozone/impl/file_surface_factory.cc",
       "ozone/impl/file_surface_factory.h",
       "ozone/surface_factory_ozone.cc",
       "ozone/surface_factory_ozone.h",
       "ozone/surface_ozone.h",
       "ozone/overlay_candidates_ozone.cc",
       "ozone/overlay_candidates_ozone.h",
     ]
   }
-  if (use_ozone && ozone_platform_dri) {
-    sources += [
-      "ozone/dri/dri_skbitmap.cc",
-      "ozone/dri/dri_skbitmap.h",
-      "ozone/dri/dri_surface.cc",
-      "ozone/dri/dri_surface.h",
-      "ozone/dri/dri_surface_factory.cc",
-      "ozone/dri/dri_surface_factory.h",
-      "ozone/dri/dri_vsync_provider.cc",
-      "ozone/dri/dri_vsync_provider.h",
-      "ozone/dri/dri_wrapper.cc",
-      "ozone/dri/dri_wrapper.h",
-      "ozone/dri/hardware_display_controller.cc",
-      "ozone/dri/hardware_display_controller.h",
-    ]
-    configs += [ "//build/config/linux:dridrm" ]
-  }
 
   if (!use_aura) {
     sources -= [
       "nine_image_painter.cc",
       "nine_image_painter.h",
       "path_aura.cc",
       "screen_aura.cc",
     ]
   }
 
@@ skipping 99 matching lines @@
 
     defines = [ "GFX_IMPLEMENTATION" ]
     configs += [ "//build/config/linux:x11" ]
 
     deps = [
       ":gfx_export",
       "//base"
     ]
   }
 }