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Breakpoint callback get an additional parameter to receive the id of the breakpoint that was hit, or 0 if the debugger pauses due to stepping. R=turnidge@google.com Review URL: https://codereview.chromium.org//110913002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@31029 260f80e4-7a28-3924-810f-c04153c831b5