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1. Look for functions/closures only in the script where the breakpoint is being set. 2. If an inner most closure is found, return that as the best fit. 3. When going over a class' functions, return immediately when a fit is found as going over the other class functions will not yield a narrower fit. BUG= R=asiva@google.com Review-Url: https://codereview.chromium.org/2898153006 .