[debugger] Stepping and break-related functions in wrapper

test/debugger/debug/debug-constructor.js

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-// Flags: --expose-debug-as debug
-// Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 // Simple function which collects a simple call graph.
 var call_graph = "";
 function listener(event, exec_state, event_data, data) {
   if (event == Debug.DebugEvent.Break)
   {
     call_graph += exec_state.frame().func().name();
     exec_state.prepareStep(Debug.StepAction.StepIn);
   }
@@ skipping 29 matching lines @@
 
 // Break point stops on "x = 1" and steps to "new c()" and then into c.
 Debug.setBreakPoint(b, 1);
 call_graph = "";
 b();
 Debug.clearStepping();  // Clear stepping as the listener leaves it on.
 assertEquals("bbccdcb", call_graph);
 
 // Get rid of the debug event listener.
 Debug.setListener(null);