Support "--with_branch_heads" for unmanaged checkouts.

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."""
 
 import logging
 import os
 import posixpath
 import re
@@ skipping 272 matching lines @@
       self.UpdateSubmoduleConfig()
       files = self._Capture(['ls-files']).splitlines()
       file_list.extend([os.path.join(self.checkout_path, f) for f in files])
       if not verbose:
         # Make the output a little prettier. It's nice to have some whitespace
         # between projects when cloning.
         print('')
       return
 
     if not managed:
+      self._UpdateBranchHeads(options, fetch=False)
       self.UpdateSubmoduleConfig()
       print ('________ unmanaged solution; skipping %s' % self.relpath)
       return
 
     if not os.path.exists(os.path.join(self.checkout_path, '.git')):
       raise gclient_utils.Error('\n____ %s%s\n'
                                 '\tPath is not a git repo. No .git dir.\n'
                                 '\tTo resolve:\n'
                                 '\t\trm -rf %s\n'
                                 '\tAnd run gclient sync again\n'
@@ skipping 954 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