[Release] Update merge script to leverage auto-tag bot

tools/release/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 224 matching lines @@
       args += ["--author", "\"%s <%s>\"" % (author, author)]
     self.Git(MakeArgs(args), **kwargs)
 
   def GitPresubmit(self, **kwargs):
     self.Git("cl presubmit", "PRESUBMIT_TREE_CHECK=\"skip\"", **kwargs)
 
   def GitCLLand(self, **kwargs):
     self.Git(
         "cl land -f --bypass-hooks", retry_on=lambda x: x is None, **kwargs)
 
+  def GitCLAddComment(self, message, **kwargs):
+    args = ["cl", "comments", "-a", Quoted(message)]
+    self.Git(MakeArgs(args), **kwargs)
+
   def GitDiff(self, loc1, loc2, **kwargs):
     return self.Git(MakeArgs(["diff", loc1, loc2]), **kwargs)
 
   def GitPull(self, **kwargs):
     self.Git("pull", **kwargs)
 
   def GitFetchOrigin(self, *refspecs, **kwargs):
     self.Git(MakeArgs(["fetch", "origin"] + list(refspecs)), **kwargs)
 
   @Strip
@@ skipping 21 matching lines @@
     value = footer_map.get(GIT_SVN_ID_FOOTER_KEY)
     if value:
       match = GIT_SVN_ID_RE.match(value)
       if match:
         return match.group(1)
     raise GitFailedException("Couldn't determine commit position for %s" %
                              git_hash)
 
   def GitGetHashOfTag(self, tag_name, **kwargs):
     return self.Git("rev-list -1 " + tag_name).strip().encode("ascii", "ignore")