Add automatic tag script.

tools/push-to-trunk/git_recipes.py

 #!/usr/bin/env python
 # Copyright 2014 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
@@ skipping 167 matching lines @@
 
   def GitDiff(self, loc1, loc2):
     return self.Git(MakeArgs(["diff", loc1, loc2]))
 
   def GitPull(self):
     self.Git("pull")
 
   def GitSVNFetch(self):
     self.Git("svn fetch")
 
+  def GitSVNRebase(self):
+    self.Git("svn rebase")
+
   # TODO(machenbach): Unused? Remove.
   @Strip
   def GitSVNLog(self):
     return self.Git("svn log -1 --oneline")
 
   @Strip
   def GitSVNFindGitHash(self, revision, branch=""):
     assert revision
     return self.Git(MakeArgs(["svn find-rev", "r%s" % revision, branch]))
 
   @Strip
   def GitSVNFindSVNRev(self, git_hash, branch=""):
     return self.Git(MakeArgs(["svn find-rev", git_hash, branch]))
 
   def GitSVNDCommit(self):
     return self.Git("svn dcommit 2>&1", retry_on=lambda x: x is None)
 
   def GitSVNTag(self, version):
     self.Git(("svn tag %s -m \"Tagging version %s\"" % (version, version)),
              retry_on=lambda x: x is None)