Teach push script to commit with roll account.

tools/push-to-trunk/push_to_trunk.py

 #!/usr/bin/env python
 # Copyright 2013 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 344 matching lines @@
     if not self.Confirm("Please check if your local checkout is sane: Inspect "
         "%s, compile, run tests. Do you want to commit this new trunk "
         "revision to the repository?" % VERSION_FILE):
       self.Die("Execution canceled.")  # pragma: no cover
 
 
 class CommitSVN(Step):
   MESSAGE = "Commit to SVN."
 
   def RunStep(self):
-    result = self.vc.Land()
+    if self._options.svn:
+      self.SVNCommit("trunk", self["commit_title"])
+    else:
+      self.vc.Land()
 
 
 class TagRevision(Step):
   MESSAGE = "Tag the new revision."
 
   def RunStep(self):
     self.vc.Tag(
         self["version"], self.vc.RemoteCandidateBranch(), self["commit_title"])
 
 
@@ skipping 69 matching lines @@
       CommitTrunk,
       SanityCheck,
       CommitSVN,
       TagRevision,
       CleanUp,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(PushToTrunk().Run())