Add script to bump up version on bleeding edge.

Add script to bump up version on bleeding edge.

The version.cc file will from now on be controlled on
bleeding edge and on trunk. The next version to use will
always be max(bleeding_edge_version, trunk_version) + 1.

The trunk and bleeding_edge versions are not semantically
tied together. The trunk branch can be used to make
independent point releases of bleeding_edge revisions.

The version on bleeding_edge will be increased if:
- the lkgr version is smaller than the version of the latest
  revision,
- the lkgr version is not a version change itself,
- the tree is not closed for maintenance.

This will allow chromium to refer directly to bleeding_edge
revisions of v8. The v8 versions will not be unique, but
they will change as often as possible, dependent on the lkgr
cycle time and the frequency this script is called.

BUG=391261
LOG=n
TEST=tools/push-to-trunk/script_test.py
TEST=tools/push-to-trunk/bump_up_version.py --dry_run
R=jarin@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=22421

[Michael Achenbach, 2014-07-15 13:30:34]

PTAL

https://codereview.chromium.org/389353003/diff/60001/tools/push-to-trunk/comm...
File tools/push-to-trunk/common_includes.py (right):

https://codereview.chromium.org/389353003/diff/60001/tools/push-to-trunk/comm...
tools/push-to-trunk/common_includes.py:174: def SortingKey(version):
Refactoring: Copied from releases.py.

https://codereview.chromium.org/389353003/diff/60001/tools/push-to-trunk/comm...
tools/push-to-trunk/common_includes.py:382: if re.match(r"\*?\s*%s$" %
re.escape(name), line):
Bugfix: The output of GitBranch is stripped. The old regexp didn't detect a
branch if it was the first in the output due to the white space requirement. It
also has problems with branch names that are not properly escaped, e.g. contain
many dashes.

https://codereview.chromium.org/389353003/diff/60001/tools/push-to-trunk/comm...
tools/push-to-trunk/common_includes.py:486: def SetVersion(self, version_file,
prefix):
Refactoring: Copied from push_to_trunk.py.

[Jarin, 2014-07-16 07:00:02]

lgtm

[Michael Achenbach, 2014-07-16 07:57:25]

Committed patchset #2 manually as r22421 (presubmit successful).