Add TIMEOUT for MultithreadedParallelIsolates

R=machenbach@chromium.org
BUG=v8:3215
LOG=N

Review URL: https://codereview.chromium.org/376963002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22283 ce2b1a6d-e550-0410-aec6-3dcde31c8c00