Split out tests of private scripts from Internals to PrivateScriptTest

Source/core/testing/PrivateScriptTest.idl

+// Copyright 2014 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.
+
+[
+    GarbageCollected
+] interface PrivateScriptTest {
+    [ImplementedInPrivateScript] void doNothing();
+    [ImplementedInPrivateScript] short return123();
+    [ImplementedInPrivateScript] short echoInteger(short value);
+    [ImplementedInPrivateScript] DOMString echoString(DOMString value);
+    [ImplementedInPrivateScript] Node echoNode(Node value);
+    [ImplementedInPrivateScript] short addInteger(short value1, short value2);
+    [ImplementedInPrivateScript] DOMString addString(DOMString value1, DOMString value2);
+    [ImplementedInPrivateScript] void setIntegerToPrototype(short value);
+    [ImplementedInPrivateScript] short getIntegerFromPrototype();
+    [ImplementedInPrivateScript] void setIntegerToDocument(Document document, short value);
+    [ImplementedInPrivateScript] short getIntegerFromDocument(Document document);
+    [ImplementedInPrivateScript] Node createElement(Document document);
+    [ImplementedInPrivateScript] void appendChild(Node node1, Node node2);
+    [ImplementedInPrivateScript] Node firstChild(Node node);
+    [ImplementedInPrivateScript] Node nextSibling(Node node);
+    [ImplementedInPrivateScript] DOMString innerHTML(Node node);
+    [ImplementedInPrivateScript] void setInnerHTML(Node node, DOMString string);
+    [ImplementedInPrivateScript] void addClickListener(Node node);
+    [ImplementedInPrivateScript] void clickNode(Document document, Node node);
+    [ImplementedInPrivateScript] readonly attribute short readonlyShortAttribute;
+    [ImplementedInPrivateScript] attribute short shortAttribute;
+    [ImplementedInPrivateScript] attribute DOMString stringAttribute;
+    [ImplementedInPrivateScript] attribute Node nodeAttribute;
+};