Add new script to create release branches.

tools/release/common_includes.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 664 matching lines @@
     output = ""
     for line in FileToText(version_file).splitlines():
       if line.startswith("#define MAJOR_VERSION"):
         line = re.sub("\d+$", self[prefix + "major"], line)
       elif line.startswith("#define MINOR_VERSION"):
         line = re.sub("\d+$", self[prefix + "minor"], line)
       elif line.startswith("#define BUILD_NUMBER"):
         line = re.sub("\d+$", self[prefix + "build"], line)
       elif line.startswith("#define PATCH_LEVEL"):
         line = re.sub("\d+$", self[prefix + "patch"], line)
+      elif (self[prefix + "candidate"] and
+            line.startswith("#define IS_CANDIDATE_VERSION")):
+        line = re.sub("\d+$", self[prefix + "candidate"], line)
       output += "%s\n" % line
     TextToFile(output, version_file)
 
 
 class BootstrapStep(Step):
   MESSAGE = "Bootstapping v8 checkout."
 
   def RunStep(self):
     if os.path.realpath(self.default_cwd) == os.path.realpath(V8_BASE):
       self.Die("Can't use v8 checkout with calling script as work checkout.")
@@ skipping 164 matching lines @@
     for (number, step_class) in enumerate([BootstrapStep] + step_classes):
       steps.append(MakeStep(step_class, number, self._state, self._config,
                             options, self._side_effect_handler))
     for step in steps[options.step:]:
       if step.Run():
         return 0
     return 0
 
   def Run(self, args=None):
     return self.RunSteps(self._Steps(), args)