Ensure tags are fetched when generating the V8 version.

Ensure tags are fetched when generating the V8 version.

This is needed so that version generation works after
bot_update fetched v8 in a chromium checkout.

TBR=tandrii@chromium.org
BUG=chromium:446166
LOG=n

Committed: https://crrev.com/ea6831e9de62ceade14b7baeb7d57c74a30a1f38
Cr-Commit-Position: refs/heads/master@{#26177}

[Michael Achenbach, 2015-01-20 22:35:48]

machenbach@chromium.org changed reviewers:
+ jkummerow@chromium.org, jochen@chromium.org, tandrii@chromium.org

[Michael Achenbach, 2015-01-20 22:37:02]

PTAL

[Michael Achenbach, 2015-01-21 07:57:43]

The CQ bit was checked by machenbach@chromium.org

[commit-bot: I haz the power, 2015-01-21 07:58:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/860163002/20001

[commit-bot: I haz the power, 2015-01-21 07:59:54]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-01-21 08:00:32]

Patchset 2 (id:??) landed as
https://crrev.com/ea6831e9de62ceade14b7baeb7d57c74a30a1f38
Cr-Commit-Position: refs/heads/master@{#26177}

[tandrii(chromium), 2015-01-21 12:08:47]

lgtm