Add test driver with the notion of perf tests.

BUG=374740
LOG=n
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/526953005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23569 ce2b1a6d-e550-0410-aec6-3dcde31c8c00