Add settings for try server.

BUG=324775
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/117043003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18324 ce2b1a6d-e550-0410-aec6-3dcde31c8c00