Set up scroll and clip parents

Source/core/testing/Internals.h

Index: Source/core/testing/Internals.h
diff --git a/Source/core/testing/Internals.h b/Source/core/testing/Internals.h
index 817c1fca405708bc3a39a8599f04ef2adbc8feba..614dd5e0049972dd1714e2004dce0618c9ed22bc 100644
--- a/Source/core/testing/Internals.h
+++ b/Source/core/testing/Internals.h
@@ -224,6 +224,12 @@ public:
 
     void setNeedsCompositedScrolling(Element*, unsigned value, ExceptionState&);
 
+    bool isScrollParent(Element* child, Element* parent, ExceptionState&);
+    bool isClipParent(Element* child, Element* parent, ExceptionState&);
+
+    PassRefPtr<ClientRect> scrollClip(Element*, ExceptionState&);
+    PassRefPtr<ClientRect> ancestorScrollClip(Element*, ExceptionState&);
+
     String repaintRectsAsText(Document*, ExceptionState&) const;
     String scrollingStateTreeAsText(Document*, ExceptionState&) const;
     String mainThreadScrollingReasons(Document*, ExceptionState&) const;