V8 Buildbot: Show V8 revision on new performance dashboard.
V8 Buildbot: Show V8 revision on new performance dashboard.

Configured perf builders to activate the V8 revision feature implemented in issue 18325010. 

See also https://codereview.chromium.org/18325010/

Review URL: https://chromiumcodereview.appspot.com/18323010

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@209641 0039d316-1c4b-4281-b951-d872f2087c98

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