Sending scope types and object refs costs nothing but would save us request that should be send to retrieve scopes informations for each frame in 'backtrace' response.
Review URL: http://codereview.chromium.org/131107

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2237 ce2b1a6d-e550-0410-aec6-3dcde31c8c00