[debug-wrapper] adapt stepping tests to inspector behavior.

test/debugger/debug/es6/debug-stepin-microtasks.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 Debug = debug.Debug
 var exception = null;
 var break_count = 0;
 const expected_breaks = 9;
 
 function listener(event, exec_state, event_data, data) {
   try {
     if (event == Debug.DebugEvent.Break) {
       assertTrue(exec_state.frameCount() != 0, "FAIL: Empty stack trace");
       var source = exec_state.frame(0).sourceLineText();
       print("paused at: " + source);
       assertTrue(source.indexOf("// Break " + break_count + ".") > 0,
                  "Unexpected pause at: " + source + "\n" +
                  "Expected: // Break " + break_count + ".");
       if (source.indexOf("StepOver.") !== -1) {
         exec_state.prepareStep(Debug.StepAction.StepNext);
+      } else if (source.indexOf("StepOut.") !== -1) {
+        exec_state.prepareStep(Debug.StepAction.StepOut);
       } else {
         exec_state.prepareStep(Debug.StepAction.StepIn);
       }
       ++break_count;
     }
   } catch (e) {
     exception = e;
     print(e, e.stack);
   }
 };
 
 Debug.setListener(listener);
 
 Promise.resolve(42)
   .then(promise1)
   .then(Object) // Should skip stepping into native.
   .then(Boolean) // Should skip stepping into native.
   .then(promise2)
   .catch(promise3)
   .then(promise4)
   .catch(function(e) {
     %AbortJS("FAIL: uncaught exception " + e);
   });
 
 function promise1() {
   debugger; // Break 0.
   return exception || 1; // Break 1.
-} // Break 2.
+} // Break 2. StepOver.
 
 function promise2() {
   throw new Error; // Break 3.
 }
 
 function promise3() {
   return break_count; // Break 4.
 } // Break 5.
 
 function promise4() {
   finalize(); // Break 6. StepOver.
   return 0; // Break 7.
-} // Break 8. StepOver.
+} // Break 8. StepOut.
 
 function finalize() {
   Promise.resolve().then(function() {
     if (expected_breaks !== break_count) {
       %AbortJS("FAIL: expected <" + expected_breaks + "> breaks instead of <" +
                break_count + ">");
     }
     if (exception !== null) {
       %AbortJS("FAIL: exception: " + exception);
     }
   });
 }