Report precise number of incrementally marked bytes to gc tracer.

BUG=
R=ernstm@chromium.org

Review URL: https://codereview.chromium.org/428263006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22776 ce2b1a6d-e550-0410-aec6-3dcde31c8c00