GN(android): Use list of libraries rather than native_lib_dir in all places

build/android/gyp/pack_relocations.py

 #!/usr/bin/env python
 #
 # 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.
 
 """Pack relocations in a library (or copy unchanged).
 
 If --enable-packing and --configuration-name=='Release', invoke the
 relocation_packer tool to pack the .rel.dyn or .rela.dyn section in the given
@@ skipping 46 matching lines @@
       help='Names of any libraries explicitly not packed')
   parser.add_option('--android-pack-relocations',
       help='Path to the relocations packer binary')
   parser.add_option('--stripped-libraries-dir',
       help='Directory for stripped libraries')
   parser.add_option('--packed-libraries-dir',
       help='Directory for packed libraries')
   parser.add_option('--libraries', action='append',
       help='List of libraries')
   parser.add_option('--stamp', help='Path to touch on success')
+  parser.add_option('--filelistjson',
+                    help='Output path of filelist.json to write')
 
   options, _ = parser.parse_args(args)
   enable_packing = (options.enable_packing == '1' and
                     options.configuration_name == 'Release')
   exclude_packing_set = set(build_utils.ParseGypList(
       options.exclude_packing_list))
 
   libraries = []
   for libs_arg in options.libraries:
     libraries += build_utils.ParseGypList(libs_arg)
 
   if options.clear_dir:
     build_utils.DeleteDirectory(options.packed_libraries_dir)
 
   build_utils.MakeDirectory(options.packed_libraries_dir)
 
+  output_paths = []
   for library in libraries:
     library_path = os.path.join(options.stripped_libraries_dir, library)
     output_path = os.path.join(
         options.packed_libraries_dir, os.path.basename(library))
+    output_paths.append(output_path)
 
     if enable_packing and library not in exclude_packing_set:
       PackLibraryRelocations(options.android_pack_relocations,
                              library_path,
                              output_path)
     else:
       CopyLibraryUnchanged(library_path, output_path)
 
+  if options.filelistjson:
+    build_utils.WriteJson({ 'files': output_paths }, options.filelistjson)
+
   if options.depfile:
     build_utils.WriteDepfile(
         options.depfile,
         libraries + build_utils.GetPythonDependencies())
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))