[debugger] Further stepping support in test wrapper

test/debugger/debug/debug-step-stub-callfunction.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 debug event handler which counts the number of breaks hit and steps.
 var break_break_point_hit_count = 0;
 function listener(event, exec_state, event_data, data) {
   if (event == Debug.DebugEvent.Break) {
     break_break_point_hit_count++;
     // Continue stepping until returned to bottom frame.
     if (exec_state.frameCount() > 1) {
       exec_state.prepareStep(Debug.StepAction.StepIn);
@@ skipping 38 matching lines @@
   var x = 's' + h(10, 20);
 };
 
 break_break_point_hit_count = 0;
 testCallInExpreesion();
 assertEquals(5, break_break_point_hit_count);
 
 
 // Get rid of the debug event listener.
 Debug.setListener(null);