Add GN build file for ui/aura target.

build/config/linux/BUILD.gn

 # Copyright (c) 2013 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("//build/config/sysroot.gni")
 
 config("sdk") {
   if (sysroot != "") {
     cflags = [ "--sysroot=" + sysroot ]
@@ skipping 59 matching lines @@
 }
 
 config("xcomposite") {
   libs = [ "Xcomposite" ]
 }
 
 config("xext") {
   libs = [ "Xext" ]
 }
 
+config("xrandr") {
+  libs = [ "xrandr" ]
+}
+
 config("libcap") {
   libs = [ "cap" ]
 }
 
 config("libresolv") {
   libs = [ "resolv" ]
 }
 
 pkg_config("gconf") {
   packages = [ "gconf-2.0" ]
@@ skipping 86 matching lines @@
 
   functions = [
     "pci_alloc",
     "pci_init",
     "pci_cleanup",
     "pci_scan_bus",
     "pci_fill_info",
     "pci_lookup_name",
   ]
 }