Added a debugger call to run a JavaScript function in the debugger. When called the debugger will be entered and the JavaScript function will be called with the debugger ExecutionState object as its first parameter.

This makes it possible to get information like current line number, current script resource, backtrace information etc. which is not part of the normal API.
Review URL: http://codereview.chromium.org/12472

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@854 ce2b1a6d-e550-0410-aec6-3dcde31c8c00