Merged r13428 into 3.14 branch.

Fix test harness to accept camel-case modes.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/12018016

git-svn-id: https://v8.googlecode.com/svn/branches/3.14@13434 ce2b1a6d-e550-0410-aec6-3dcde31c8c00