[debug-wrapper] Further extend the debug wrapper

test/debugger/debug/es6/debug-evaluate-arrow-function-receiver.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
 
 // Test that debug-evaluate can find the correct this value for an arrow
 // function, if "this" is referenced within the arrow function scope.
 
 Debug = debug.Debug
 
 var break_count = 0;
 var exception = null;
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Break) return;
   try {
     for (var i = 0; i < exec_state.frameCount() - 1; i++) {
       var frame = exec_state.frame(i);
-      var this_value = frame.evaluate("this").value();
+      var this_value = frame.evaluate("'' + this").value();
       var expected = frame.sourceLineText().match(/\/\/ (.*$)/)[1];
       print(expected, this_value, frame.sourceLineText());
       assertEquals(String(expected), String(this_value));
     }
     break_count++;
   } catch (e) {
     exception = e;
     print(e + e.stack);
   }
 }
@@ skipping 76 matching lines @@
 
 (() => {
   (() => this);
   debugger;          // [object global]
 })();
 
 Debug.setListener(null);
 
 assertEquals(55, break_count);
 assertNull(exception);