new_contents: # 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.
  
  """Presubmit script for ui.
  
  See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
  for more details about the presubmit API built into depot_tools.
  """
  
  INCLUDE_CPP_FILES_ONLY = (
    r'.*\.(cc|h|mm)$',
  )
  
  def CheckScopedPtr(input_api, output_api,
                     white_list=INCLUDE_CPP_FILES_ONLY, black_list=None):
    black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
    source_file_filter = lambda x: input_api.FilterSourceFile(x,
                                                              white_list,
                                                              black_list)
    errors = []
    for f in input_api.AffectedSourceFiles(source_file_filter):
      for line_number, line in f.ChangedContents():
        # Disallow:
        # scoped_ptr<T>()
        if re.search(r'\bscoped_ptr<.*?>\(\)', line):
          errors.append(output_api.PresubmitError(
            '%s:%d uses scoped_ptr<T>(). Use nullptr instead.' %
            (f.LocalPath(), line_number)))
    return errors
  
  
  def CheckChange(input_api, output_api):
    results = []
    results += CheckScopedPtr(input_api, output_api)
    return results
  
  
  def CheckChangeOnUpload(input_api, output_api):
    return CheckChange(input_api, output_api)
  
  
  def CheckChangeOnCommit(input_api, output_api):
    return CheckChange(input_api, output_api)
  
subject: Add PRESUBMIT script to check the usage of scoped_ptr.