Add the concept of a V8 extras exports object

test/cctest/test-extra.js

Index: test/cctest/test-extra.js
diff --git a/test/message/regress/regress-3995.js b/test/cctest/test-extra.js
similarity index 59%
copy from test/message/regress/regress-3995.js
copy to test/cctest/test-extra.js
index ba84bc096527cc242b9ad43983b42eec0462c43c..4584352d1d5d4b7c6a369f23691538bd283dacda 100644
--- a/test/message/regress/regress-3995.js
+++ b/test/cctest/test-extra.js
@@ -2,6 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-(function() {
-  throw new Error("boom");
+(function () {
+    'use strict';
+
+    extrasExports.testExtraShouldReturnFive = function () {
+        return 5;
+    };
 })();