Refactoring: Extract interface for VC in release scripts.

tools/push-to-trunk/bump_up_version.py

 #!/usr/bin/env python
 # Copyright 2014 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 Script for auto-increasing the version on bleeding_edge.
 
 The script can be run regularly by a cron job. It will increase the build
 level of the version on bleeding_edge if:
@@ skipping 10 matching lines @@
 
 import argparse
 import os
 import sys
 
 from common_includes import *
 
 VERSION_BRANCH = "auto-bump-up-version"
 
 
+#TODO(machenbach): Add vc interface that works on git mirror.
 class Preparation(Step):
   MESSAGE = "Preparation."
 
   def RunStep(self):
     # Check for a clean workdir.
     if not self.GitIsWorkdirClean():  # pragma: no cover
       # This is in case a developer runs this script on a dirty tree.
       self.GitStash()
 
     self.GitCheckout("master")
@@ skipping 193 matching lines @@
       GetLKGRVersion,
       LKGRVersionUpToDateBailout,
       GetTrunkVersion,
       CalculateVersion,
       CheckTreeStatus,
       ChangeVersion,
     ]
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(BumpUpVersion().Run())