Add option to gclient to ignore cache locks

gclient_scm.py

 # Copyright (c) 2012 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.
 
 """Gclient-specific SCM-specific operations."""
 
 from __future__ import print_function
 
 import errno
 import logging
@@ skipping 763 matching lines @@
   def _UpdateMirror(mirror, options):
     """Update a git mirror by fetching the latest commits from the remote."""
     if options.shallow:
       # HACK(hinoka): These repositories should be super shallow.
       if 'flash' in mirror.url:
         depth = 10
       else:
         depth = 10000
     else:
       depth = None
-    mirror.populate(verbose=options.verbose, bootstrap=True, depth=depth)
+    mirror.populate(verbose=options.verbose, bootstrap=True, depth=depth,
+                    ignore_lock=options.ignore_locks)
     mirror.unlock()
 
   def _Clone(self, revision, url, options):
     """Clone a git repository from the given URL.
 
     Once we've cloned the repo, we checkout a working branch if the specified
     revision is a branch head. If it is a tag or a specific commit, then we
     leave HEAD detached as it makes future updates simpler -- in this case the
     user should first create a new branch or switch to an existing branch before
     making changes in the repo."""
@@ skipping 694 matching lines @@
       new_command.append('--force')
       if command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
         new_command.extend(('--accept', 'theirs-conflict'))
     elif options.manually_grab_svn_rev:
       new_command.append('--force')
       if command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
         new_command.extend(('--accept', 'postpone'))
     elif command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
       new_command.extend(('--accept', 'postpone'))
     return new_command