Handle storyboards in GN.

build/config/mac/rules.gni

 # Copyright 2015 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/mac/base_rules.gni")
 
 # Generates Info.plist files for Mac apps and frameworks.
 #
 # Arguments
 #
@@ skipping 59 matching lines @@
 #     sources:
 #         list of string, sources to comiple
 #
 #     output_path:
 #         (optional) string, the path to use for the outputs list in the
 #         bundle_data step. If unspecified, defaults to bundle_resources_dir.
 template("mac_xib_bundle_data") {
   _target_name = target_name
   _compile_target_name = _target_name + "_compile_ibtool"
 
-  compile_xibs(_compile_target_name) {
+  compile_ib_files(_compile_target_name) {
     forward_variables_from(invoker, [ "testonly" ])
     visibility = [ ":$_target_name" ]
     sources = invoker.sources
+    output_extension = "nib"
     ibtool_flags = [
       "--minimum-deployment-target",
       mac_deployment_target,
 
       # TODO(rsesek): Enable this once all the bots are on Xcode 7+.
       # "--target-device",
       # "mac",
     ]
   }
 
@@ skipping 588 matching lines @@
                            ])
     if (!defined(deps)) {
       deps = []
     }
     deps += [ ":$_loadable_module_bundle_data" ]
 
     bundle_root_dir = "$root_out_dir/$_output_name.plugin/Contents"
     bundle_executable_dir = "$bundle_root_dir/MacOS"
   }
 }