NOT FOR COMMIT: test that interceptors work with the inspector.

test/debugger/test-api.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.
 
 "use strict";
 
 // If true, prints all messages sent and received by inspector.
-const printProtocolMessages = false;
+const printProtocolMessages = true;
 
 // The active wrapper instance.
 let activeWrapper = undefined;
 
 // Receiver function called by inspector, delegating to active wrapper.
 function receive(message) {
   activeWrapper.receiveMessage(message);
 }
 
 class DebugWrapper {
@@ skipping 883 matching lines @@
     debug.instance = new DebugWrapper();
     debug.instance.enable();
   }
   return debug.instance;
 }});
 
 Object.defineProperty(debug, 'ScopeType', { get: function() {
   const instance = debug.Debug;
   return instance.ScopeType;
 }});