Blink-in-JS: Implement internal APIs exposed only to private scripts

Source/core/testing/PrivateScriptTest.js

Index: Source/core/testing/PrivateScriptTest.js
diff --git a/Source/core/testing/PrivateScriptTest.js b/Source/core/testing/PrivateScriptTest.js
index 1f4100575b549c1c59a31aa9d463d70980bc4004..255485a6912e72615a8edcad12de0baecc9f5fa4 100644
--- a/Source/core/testing/PrivateScriptTest.js
+++ b/Source/core/testing/PrivateScriptTest.js
@@ -131,4 +131,13 @@ installClass("PrivateScriptTest", function(global, InternalsPrototype) {
         get: function() { return this.m_stringAttributeForPrivateScriptOnly; },
         set: function(value) { this.m_stringAttributeForPrivateScriptOnly = value; }
     });
+
+    InternalsPrototype.addIntegerImplementedInCPP = function(value1, value2) {
+        return this.addIntegerImplementedInCPPForPrivateScriptOnly(value1, value2);
+    }
+
+    Object.defineProperty(InternalsPrototype, "stringAttributeImplementedInCPP", {
+        get: function() { return this.m_stringAttributeImplementedInCPPForPrivateScriptOnly; },
+        set: function(value) { this.m_stringAttributeImplementedInCPPForPrivateScriptOnly = value; }
+    });
 });