Add base/files/file_tracing.cc to tools/gn/bootstrap/bootstrap.py.

tools/gn/bootstrap/bootstrap.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.
 
 """Bootstraps gn.
 
 It is done by first building it manually in a temporary directory, then building
 it with its own BUILD.gn to the final destination.
 """
@@ skipping 138 matching lines @@
       'base/callback_internal.cc',
       'base/command_line.cc',
       'base/debug/alias.cc',
       'base/debug/stack_trace.cc',
       'base/debug/task_annotator.cc',
       'base/environment.cc',
       'base/files/file.cc',
       'base/files/file_enumerator.cc',
       'base/files/file_path.cc',
       'base/files/file_path_constants.cc',
+      'base/files/file_tracing.cc',
       'base/files/file_util.cc',
       'base/files/scoped_file.cc',
       'base/json/json_parser.cc',
       'base/json/json_reader.cc',
       'base/json/json_string_value_serializer.cc',
       'base/json/json_writer.cc',
       'base/json/string_escape.cc',
       'base/lazy_instance.cc',
       'base/location.cc',
       'base/logging.cc',
@@ skipping 238 matching lines @@
     cmd.append('-v')
   cmd.append('gn')
   check_call(cmd)
 
   if not options.debug:
     check_call(['strip', os.path.join(build_dir, 'gn')])
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))