Workaround a git clone bug on Windows.

gclient_scm.py

 # Copyright (c) 2010 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 475 matching lines @@
     clone_cmd = ['clone']
     if revision.startswith('refs/heads/'):
       clone_cmd.extend(['-b', revision.replace('refs/heads/', '')])
       detach_head = False
     else:
       detach_head = True
     if options.verbose:
       clone_cmd.append('--verbose')
     clone_cmd.extend([url, self.checkout_path])
 
+    # If the parent directory does not exist, Git clone on Windows will not
+    # create it, so we need to do it manually.
+    parent_dir = os.path.dirname(self.checkout_path)
+    if not os.path.exists(parent_dir):
+      os.makedirs(parent_dir)
+
     for _ in range(3):
       try:
         self._Run(clone_cmd, options, cwd=self._root_dir)
         break
       except (gclient_utils.Error, subprocess2.CalledProcessError), e:
         # TODO(maruel): Hackish, should be fixed by moving _Run() to
         # CheckCall().
         # Too bad we don't have access to the actual output.
         # We should check for "transfer closed with NNN bytes remaining to
         # read". In the meantime, just make sure .git exists.
@@ skipping 425 matching lines @@
 
     This method returns a new list to be used as a command."""
     new_command = command[:]
     if revision:
       new_command.extend(['--revision', str(revision).strip()])
     # --force was added to 'svn update' in svn 1.5.
     if ((options.force or options.manually_grab_svn_rev) and
         scm.SVN.AssertVersion("1.5")[0]):
       new_command.append('--force')
     return new_command