Add a flag to lexer-shell to replicate input file.

R=verwaest@chromium.org

Review URL: https://chromiumcodereview.appspot.com/71783002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17709 ce2b1a6d-e550-0410-aec6-3dcde31c8c00