Add tag write access to merge script.

tools/push-to-trunk/merge_to_branch.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 180 matching lines @@
     # Add a commit message title.
     if self._options.revert:
       if not self._options.revert_bleeding_edge:
         title = ("Version %s (rollback of %s)"
                  % (self["version"], self["revision_list"]))
       else:
         title = "Revert %s." % self["revision_list"]
     else:
       title = ("Version %s (merged %s)"
                % (self["version"], self["revision_list"]))
+    self["commit_title"] = title
     self["new_commit_msg"] = "%s\n\n%s" % (title, self["new_commit_msg"])
     TextToFile(self["new_commit_msg"], self.Config("COMMITMSG_FILE"))
     self.GitCommit(file_name=self.Config("COMMITMSG_FILE"))
 
 
 class CommitRepository(Step):
   MESSAGE = "Commit to the repository."
 
   def RunStep(self):
     self.GitCheckout(self.Config("BRANCHNAME"))
     self.WaitForLGTM()
     self.GitPresubmit()
     self.vc.CLLand()
 
 
 class TagRevision(Step):
   MESSAGE = "Create the tag."
 
   def RunStep(self):
     if self._options.revert_bleeding_edge:
       return
-    print "Creating tag svn/tags/%s" % self["version"]
-    self.vc.Tag(self["version"], self.vc.RemoteBranch(self["merge_to_branch"]))
+    print "Creating tag %s" % self["version"]
+    self.vc.Tag(self["version"],
+                self.vc.RemoteBranch(self["merge_to_branch"]),
+                self["commit_title"])
 
 
 class CleanUp(Step):
   MESSAGE = "Cleanup."
 
   def RunStep(self):
     self.CommonCleanup()
     if not self._options.revert_bleeding_edge:
       print "*** SUMMARY ***"
       print "version: %s" % self["version"]
@@ skipping 62 matching lines @@
       CommitLocal,
       UploadStep,
       CommitRepository,
       TagRevision,
       CleanUp,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(MergeToBranch().Run())