[debug-wrapper] Further extend the debug wrapper

test/mjsunit/es6/debug-stepin-proxies.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
-
-Debug = debug.Debug
-
-var exception = null;
-var log = [];
-
-function listener(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.Break) return;
-  try {
-    print(event_data.sourceLineText());
-    var entry = "";
-    for (var i = 0; i < exec_state.frameCount(); i++) {
-      entry += exec_state.frame(i).sourceLineText().substr(-1);
-      entry += exec_state.frame(i).sourceColumn();
-    }
-    log.push(entry);
-    exec_state.prepareStep(Debug.StepAction.StepIn);
-  } catch (e) {
-    exception = e;
-  }
-};
-
-var target = {};
-var handler = {
-  has: function(target, name) {
-    return true;                     // h
-  },                                 // i
-  get: function(target, name) {
-    return 42;                       // j
-  },                                 // k
-  set: function(target, name, value) {
-    return false;                    // l
-  },                                 // m
-}
-
-var proxy = new Proxy(target, handler);
-
-Debug.setListener(listener);
-debugger;                            // a
-var has = "step" in proxy;           // b
-var get = proxy.step;                // c
-proxy.step = 43;                     // d
-
-Debug.setListener(null);             // g
-
-assertNull(exception);
-assertTrue(has);
-assertEquals(42, get);
-
-assertEquals([
-  "a0",
-  "b17", "h4b17", "i2b17",  // [[Has]]
-  "c15", "j4c15", "k2c15",  // [[Get]]
-  "d0", "l4d11", "m2d11",   // [[Set]]
-  "g0"
-], log);