gn: Pass pkg_config_args when invoking pkg_config_script.

ui/accessibility/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("//build/config/ui.gni")
 import("//build/json_schema_api.gni")
 import("//testing/test.gni")
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 if (use_x11) {
   pkg_config("atk") {
     packages = [ "atk" ]
     atk_lib_dir = exec_script(pkg_config_script,
-                              [
-                                "--libdir",
-                                "atk",
-                              ],
+                              pkg_config_args + [
+                                    "--libdir",
+                                    "atk",
+                                  ],
                               "string")
     defines = [ "ATK_LIB_DIR=\"$atk_lib_dir\"" ]
   }
 
   # gn orders flags on a target before flags from configs. The default config
   # adds -Wall, and these flags have to be after -Wall -- so they need to come
   # from a config and can't be on the target directly.
   config("atk_warnings") {
     cflags = [
       # glib uses the pre-c++11 typedef-as-static_assert hack.
@@ skipping 132 matching lines @@
 json_schema_api("ax_gen") {
   sources = [
     "ax_enums.idl",
   ]
   deps = [
     "//base/third_party/dynamic_annotations",
   ]
   root_namespace = "ui"
   schemas = true
 }