Show v8 bleeding edge revision in trunk and Chromium commit message.

Show v8 bleeding edge revision in trunk and Chromium commit message.

This allows to map from a V8 Chromium roll to the bleeding_edge revision used for the roll.

This CL also improves some test code:
 - Don't loose assertion exceptions in mocked git on retry.
 - Remove an unused method

BUG=337167
LOG=n
R=jkummerow@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=18778

[Michael Achenbach, 2014-01-23 12:46:15]

PTAL

[Jakob Kummerow, 2014-01-23 12:57:35]

LGTM with comment

https://codereview.chromium.org/139993006/diff/30001/tools/push-to-trunk/push...
File tools/push-to-trunk/push_to_trunk.py (right):

https://codereview.chromium.org/139993006/diff/30001/tools/push-to-trunk/push...
tools/push-to-trunk/push_to_trunk.py:300: "\\1 (V8 revision r%s)" %
svn_revision,
Let's s/V8 revision/based on bleeding_edge revision/ or something to that
effect.

[Michael Achenbach, 2014-01-23 13:02:42]

https://codereview.chromium.org/139993006/diff/30001/tools/push-to-trunk/push...
File tools/push-to-trunk/push_to_trunk.py (right):

https://codereview.chromium.org/139993006/diff/30001/tools/push-to-trunk/push...
tools/push-to-trunk/push_to_trunk.py:300: "\\1 (V8 revision r%s)" %
svn_revision,
On 2014/01/23 12:57:36, Jakob wrote:
> Let's s/V8 revision/based on bleeding_edge revision/ or something to that
> effect.

Done.

[Jakob Kummerow, 2014-01-23 13:03:41]

lgtm

[Michael Achenbach, 2014-01-23 13:45:00]

Committed patchset #3 manually as r18778 (presubmit successful).