Add v8 revision to trigger step.
Add v8 revision to trigger step.

Without this change, V8 tester bots sync to the newest v8 revision, instead of the one from the builder bot.

BUG=312253

Review URL: https://codereview.chromium.org/101533002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@238331 0039d316-1c4b-4281-b951-d872f2087c98

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