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

Source/core/testing/PrivateScriptTest.h

Index: Source/core/testing/PrivateScriptTest.h
diff --git a/Source/core/testing/PrivateScriptTest.h b/Source/core/testing/PrivateScriptTest.h
index a7133815cf6ead0a6dbb85504edeae43d153a7bd..c0fb370916f287c0d4f2f1d493f70320c44b3f5d 100644
--- a/Source/core/testing/PrivateScriptTest.h
+++ b/Source/core/testing/PrivateScriptTest.h
@@ -8,6 +8,7 @@
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
 #include "wtf/RefCounted.h"
+#include "wtf/text/WTFString.h"
 
 namespace blink {
 
@@ -20,10 +21,16 @@ public:
         return new PrivateScriptTest(frame);
     }
 
+    int addIntegerImplementedInCPPForPrivateScriptOnly(int value1, int value2);
+    String stringAttributeImplementedInCPPForPrivateScriptOnly();
+    void setStringAttributeImplementedInCPPForPrivateScriptOnly(String);
+
     void trace(Visitor*) { }
 
 private:
-    PrivateScriptTest(LocalFrame*);
+    explicit PrivateScriptTest(LocalFrame*);
+
+    String m_stringAttributeImplementedInCPPForPrivateSriptOnly;
 };
 
 } // namespace blink