Moving check_package_boundaries to the presubmit checks directory

PRESUBMIT.py

 # Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import json
 import os
@@ skipping 314 matching lines @@
         'GN targets cannot mix .cc and .c source files. Please create a '
         'separate target for each collection of sources.\n'
         'Mixed sources: \n'
         '%s\n'
         'Violating GN files:' % json.dumps(violating_gn_files, indent=2),
         items=violating_gn_files.keys())]
   return []
 
 def _CheckNoPackageBoundaryViolations(input_api, gn_files, output_api):
   cwd = input_api.PresubmitLocalPath()
-  script_path = os.path.join('tools_webrtc', 'check_package_boundaries.py')
+  script_path = os.path.join('tools_webrtc', 'presubmit_checks_lib',
+                             'check_package_boundaries.py')
   webrtc_path = os.path.join('webrtc')
   command = [sys.executable, script_path, webrtc_path]
   command += [gn_file.LocalPath() for gn_file in gn_files]
   returncode, _, stderr = _RunCommand(command, cwd)
   if returncode:
     return [output_api.PresubmitError(
         'There are package boundary violations in the following GN files:\n\n'
         '%s' % stderr)]
   return []
 
@@ skipping 283 matching lines @@
     if f.LocalPath().endswith('.h') and f.Action() == 'A':
       file_path = os.path.abspath(f.LocalPath())
       root_dir = os.getcwd()
       gn_file_path = GetBuildGnPathFromFilePath(file_path, os.path.exists,
                                                 root_dir)
       in_build_gn = IsHeaderInBuildGn(file_path, gn_file_path)
       if not in_build_gn:
         results.append(output_api.PresubmitError(error_msg.format(
             file_path, gn_file_path)))
   return results