[debugger] Basic scope functionality and exception events in wrapper

test/mjsunit/regress/regress-crbug-609046.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
-
-// Test that hidden scopes are correctly walked in the scope chain.
-
-var Debug = debug.Debug;
-var exception = null;
-var delegate = null;
-var done = false;
-
-function listener(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.Break) return;
-  try {
-    assertEquals([ debug.ScopeType.Block,
-                   debug.ScopeType.Script,
-                   debug.ScopeType.Global ],
-                 exec_state.frame(0).allScopes().map(s => s.scopeType()));
-    done = true;
-  } catch (e) {
-    exception = e;
-  }
-}
-
-Debug.setListener(listener);
-
-for(let a = 0; a < 3; a++) {
-  debugger;
-  eval();  // Force context-allocation of everything.
-}
-
-Debug.setListener(null);
-assertNull(exception);
-assertTrue(done);