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port as the unique ID to represent an isolate in the debugger message format. 2. Switch the Event handler API to use an isolate id instead of the isolate object itself. 3. Add a unit test case for isolate debugger event handling with an interrupt of isolate to ensure that interrupting the isolate runs the interrupt event handler. Review URL: https://codereview.chromium.org//11052006 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@13207 260f80e4-7a28-3924-810f-c04153c831b5