V8 Buildbot: Show V8 lkgr on waterfall.
V8 Buildbot: Show V8 lkgr on waterfall.

TBR=ulan@chromium.org, 
BUG=

Review URL: https://codereview.chromium.org/83403002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@236767 0039d316-1c4b-4281-b951-d872f2087c98

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