Add whitespace file to allow no-op changelists for bot maintenance.

BUG=
TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/323033002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21729 ce2b1a6d-e550-0410-aec6-3dcde31c8c00