Work on GN build, mostly in //ui

build/repack_action.gypi

 # 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.
 
 # This file is meant to be included into an action to invoke grit repack in a
 # consistent manner. To use this the following variables need to be
 # defined:
 #   pak_inputs: list: paths of pak files that need to be combined.
-#   pak_output: string: the output pak file path. 
+#   pak_output: string: the output pak file path.
 
 {
+  # GYP version: //tools/grit/repack.gni
   'variables': {
     'repack_path': '<(DEPTH)/tools/grit/grit/format/repack.py',
     'repack_options%': [],
   },
   'inputs': [
     '<(repack_path)',
     '<@(pak_inputs)',
   ],
   'outputs': [
     '<(pak_output)'
   ],
   'action': [
     'python',
     '<(repack_path)',
     '<@(repack_options)',
     '<(pak_output)',
     '<@(pak_inputs)',
   ],
 }