Make V8ValueConverterImpl serialize objects with internal field counts to an

chrome/test/data/extensions/api_test/executescript/callback/test.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var relativePath =
     '/extensions/api_test/executescript/callback/test.html';
 var testUrl = 'http://b.com:PORT' + relativePath;
 
 chrome.test.getConfig(function(config) {
   testUrl = testUrl.replace(/PORT/, config.testServer.port);
@@ skipping 68 matching lines @@
 
       function executeCallbackObjShouldSucceed() {
         var scriptDetails = {code: 'var obj = {"id": "foo", "bar": 9}; obj'};
         chrome.tabs.executeScript(tabId, scriptDetails, function(scriptVal) {
           chrome.tabs.get(tabId, chrome.test.callbackPass(function(tab) {
             chrome.test.assertEq({"id": "foo", "bar": 9}, scriptVal[0]);
           }));
         });
       },
 
-      // DOM objects (nodes, properties, etc) should not get converted. We
-      // could try to convert them the best they can but it's undefined what
-      // that means.
+      // DOM objects (nodes, properties, etc) should be converted to empty
+      // objects. We could try to convert them the best they can but it's
+      // undefined what that means. Ideally it'd just throw an exception but
+      // the backwards compatible ship sailed long ago.
       function executeCallbackDOMObjShouldSucceedAndReturnNull() {
         [ 'document',
           'document.getElementById("testDiv")',
           'new XMLHttpRequest()',
           'document.location',
           'navigator',
         ].forEach(function(expr) {
           chrome.tabs.executeScript(tabId,
                                     {code: 'var obj = ' + expr + '; obj'},
                                     chrome.test.callbackPass(function(result) {
-            chrome.test.assertEq([null], result, 'Failed for ' + expr);
+            chrome.test.assertEq([{}], result, 'Failed for ' + expr);
           }));
         });
       },
 
       // All non-integer properties are droped.
       function executeCallbackArrayWithNonNumericFieldsShouldSucceed() {
         var scriptDetails = {}
         scriptDetails.code = 'var arr = [1, 2]; arr.foo = "bar"; arr;';
         chrome.tabs.executeScript(tabId, scriptDetails, function(scriptVal) {
           chrome.tabs.get(tabId, chrome.test.callbackPass(function(tab) {
@@ skipping 39 matching lines @@
             // is not null
             chrome.test.assertFalse(null == scriptVal[0]);
           }));
         });
       },
     ]);
   });
   chrome.tabs.create({ url: testUrl });
 
 });