[debugger] Further stepping support in test wrapper

test/debugger/debug/debug-stepnext-do-while.js

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-// Flags: --expose-debug-as debug
-// Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 var exception = null;
 var break_break_point_hit_count = 0;
 
 function listener(event, exec_state, event_data, data) {
   try {
     if (event == Debug.DebugEvent.Break) {
       if (break_break_point_hit_count == 0) {
         assertEquals('    debugger;',
@@ skipping 30 matching lines @@
   } while(condition());
 };
 
 break_break_point_hit_count = 0;
 runDoWhile();
 assertNull(exception);
 assertEquals(4, break_break_point_hit_count);
 
 // Get rid of the debug event listener.
 Debug.setListener(null);