Calculate new version based on latest tag when pushing.

tools/push-to-trunk/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 588 matching lines @@
     branch = "" if parent_hash else branch or self.vc.RemoteCandidateBranch()
     return self.GitLog(n=1, format="%H", grep=push_pattern,
                        parent_hash=parent_hash, branch=branch)
 
   def ArrayToVersion(self, prefix):
     return ".".join([self[prefix + "major"],
                      self[prefix + "minor"],
                      self[prefix + "build"],
                      self[prefix + "patch"]])
 
+  def StoreVersion(self, version, prefix):
+    version_parts = version.split(".")
+    if len(version_parts) == 3:
+      version_parts.append("0")
+    major, minor, build, patch = version_parts
+    self[prefix + "major"] = major
+    self[prefix + "minor"] = minor
+    self[prefix + "build"] = build
+    self[prefix + "patch"] = patch
+
   def SetVersion(self, version_file, prefix):
     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"):
@@ skipping 175 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)