Debug: Allow stepping into on a given call frame.

BUG=chromium:296963
R=yangguo@chromium.org, yurys

Review URL: https://codereview.chromium.org/25605005

Patch from Andrey Adaikin <aandrey@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17095 ce2b1a6d-e550-0410-aec6-3dcde31c8c00