[debug-wrapper] Further extend the debug wrapper

test/mjsunit/regress/regress-crbug-119800.js

-// Copyright 2015 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.
-
-// Flags: --expose-debug-as debug
-
-function f() {
-  print(1);
-  print(2);
-  print(3);
-}
-
-var Debug = debug.Debug;
-var exception = null;
-var breaks = [];
-
-function listener(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.Break) return;
-  try {
-    Debug.debuggerFlags().breakPointsActive.setValue(false);
-    breaks.push(exec_state.frame().sourceLineText().trimLeft());
-    exec_state.prepareStep(Debug.StepAction.StepIn);
-  } catch (e) {
-    exception = e;
-  }
-}
-
-Debug.setListener(listener);
-Debug.setBreakPoint(f, 0, 0);
-
-f();
-
-Debug.setListener(null);
-Debug.debuggerFlags().breakPointsActive.setValue(true);
-
-assertNull(exception);
-assertEquals(breaks, ["print(1);", "print(2);", "print(3);", "}",
-                      "Debug.setListener(null);"]);