Polymer: use polymer-css-build --no-inline-includes

chrome/browser/resources/polymer_css_build_gn.py

 #!/usr/bin/env python
 # Copyright 2017 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 argparse
 import os
 import sys
 
 _HERE_PATH = os.path.dirname(__file__)
 _SRC_PATH = os.path.normpath(os.path.join(_HERE_PATH, '..', '..', '..'))
 _CWD = os.getcwd()
 
 sys.path.append(os.path.join(_SRC_PATH, 'third_party', 'node'))
 import node
 import node_modules
 
 def _css_build(out_folder, input_files, output_files):
   out_path = os.path.join(_CWD, out_folder)
   in_paths = map(lambda f: os.path.join(out_path, f), input_files)
   out_paths = map(lambda f: os.path.join(out_path, f), output_files)
 
-  node.RunNode([node_modules.PathToPolymerCssBuild(), '-f'] + in_paths +
-               ['-o'] + out_paths)
+  args = ['--no-inline-includes', '-f'] + in_paths + ['-o'] + out_paths
+  node.RunNode([node_modules.PathToPolymerCssBuild()] + args)
 
 
 def main():
   parser = argparse.ArgumentParser()
   parser.add_argument('--out_folder')
   parser.add_argument('--input_files', nargs='+')
   parser.add_argument('--output_files', nargs='+')
   args = parser.parse_args()
 
   _css_build(
       args.out_folder,
       input_files=args.input_files,
       output_files=args.output_files)
 
 
 if __name__ == '__main__':
   main()