[debugger] Further stepping support in test wrapper

test/debugger/debug/debug-stepin-builtin-callback.js

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-// Flags: --expose-debug-as debug
 
 // Test stepping into callbacks passed to builtin functions.
 
 Debug = debug.Debug
 
 var exception = null;
 
 function array_listener(event, exec_state, event_data, data) {
   try {
     if (event == Debug.DebugEvent.Break) {
@@ skipping 96 matching lines @@
   print("back.");           // B12 B18 B24 B36
 }                           // B13 B19 B25 B37
 
 breaks = 0;
 Debug.setListener(array_listener);
 debugger;                   // B0
 a.forEach(cb_foreach);      // B1
 Debug.setListener(null);    // B38
 assertNull(exception);
 assertEquals(39, breaks);