[debug-wrapper] Further extend the debug wrapper

test/mjsunit/regress/regress-5164.js

-// Copyright 2016 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
-
-var failure = null;
-var args;
-
-function listener(event, exec_state, event_data, data) {
-  if (event != debug.Debug.DebugEvent.Break) return;
-  try {
-    args = exec_state.frame(0).evaluate('arguments').value();
-  } catch (e) {
-    failure = e;
-  }
-}
-
-debug.Debug.setListener(listener);
-
-function* gen(a, b) {
-  debugger;
-  yield a;
-  yield b;
-}
-
-var foo = gen(1, 2);
-
-foo.next()
-assertEquals(2, args.length);
-assertEquals(undefined, args[0]);
-assertEquals(undefined, args[1]);
-
-foo.next()
-assertEquals(2, args.length);
-assertEquals(undefined, args[0]);
-assertEquals(undefined, args[1]);
-
-foo.next()
-assertEquals(2, args.length);
-assertEquals(undefined, args[0]);
-assertEquals(undefined, args[1]);
-
-assertNull(failure);