Add recipe for v8

fetch.py

 #!/usr/bin/env python
 # Copyright (c) 2013 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.
 
 """
 Tool to perform checkouts in one easy command line!
 
 Usage:
   fetch <recipe> [--property=value [--property2=value2 ...]]
@@ skipping 93 matching lines @@
     gclient_spec = '\n'.join('%s = %s' % (key, self.spec[key])
                              for key in keys if key in self.spec)
     self.spec['gclient_spec'] = gclient_spec
 
   def exists(self):
     return os.path.exists(os.path.join(os.getcwd(), self.root))
 
   def init(self):
     # Configure and do the gclient checkout.
     self.run_gclient('config', '--spec', self.spec['gclient_spec'])
+    sync_cmd = ['sync']
     if self.options.nohooks:
-      self.run_gclient('sync', '--nohooks')
-    else:
-      self.run_gclient('sync')
+      sync_cmd.append('--nohooks')
+    if self.spec.get('with_branch_heads', False):
+      sync_cmd.append('--with_branch_heads')
+    self.run_gclient(*sync_cmd)
 
     # Configure git.
     wd = os.path.join(self.base, self.root)
     if self.options.dry_run:
       print 'cd %s' % wd
     self.run_git(
         'submodule', 'foreach',
         'git config -f $toplevel/.git/config submodule.$name.ignore all',
         cwd=wd)
     self.run_git(
@@ skipping 24 matching lines @@
     super(GclientGitSvnCheckout, self).init()
 
     # Configure git-svn.
     for path, svn_spec in git_svn_dirs.iteritems():
       real_path = os.path.join(*path.split('/'))
       if real_path != self.root:
         real_path = os.path.join(self.root, real_path)
       wd = os.path.join(self.base, real_path)
       if self.options.dry_run:
         print 'cd %s' % wd
-      self.run_git('svn', 'init', '--prefix=origin/', '-T',
+      prefix = svn_spec.get('svn_prefix', 'origin/')
+      self.run_git('svn', 'init', '--prefix=' + prefix, '-T',
                    svn_spec['svn_branch'], svn_spec['svn_url'], cwd=wd)
       self.run_git('config', '--replace', 'svn-remote.svn.fetch',
-                   svn_spec['svn_branch'] + ':refs/remotes/origin/' +
+                   svn_spec['svn_branch'] + ':refs/remotes/' + prefix +
                    svn_spec['svn_ref'], cwd=wd)
       self.run_git('svn', 'fetch', cwd=wd)
 
 
 
 CHECKOUT_TYPE_MAP = {
     'gclient':         GclientCheckout,
     'gclient_git':     GclientGitCheckout,
     'gclient_git_svn': GclientGitSvnCheckout,
     'git':             GitCheckout,
@@ skipping 114 matching lines @@
 
 
 def main():
   options, recipe, props = handle_args(sys.argv)
   spec, root = run_recipe_fetch(recipe, props)
   return run(options, spec, root)
 
 
 if __name__ == '__main__':
   sys.exit(main())