This adds functionality for getting original functions from bound functions.

It's of much use when information about function calls is shown on the Events timeline in DevTools: instead of referencing to v8natives.js where bound functions are created, we'll be able to show real function data (name, resource, script line and column numbers) retrieved from original functions.

BUG=None
LOG=Y
R=yangguo@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/106763002

Patch from Alexandra Mikhaylova <amikhaylova@google.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18401 ce2b1a6d-e550-0410-aec6-3dcde31c8c00