Let bot_update display also the v8 revision.
Let bot_update display also the v8 revision.

BUG=

Review URL: https://codereview.chromium.org/272983002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@269465 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build