Set up scroll and clip parents

Source/core/testing/Internals.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 168 matching lines @@
     [RaisesException] NodeList paintOrderListAfterPromote(Element element);
 
     [RaisesException] boolean scrollsWithRespectTo(Element element1, Element element2);
 
     // The values of these constants must be kept in sync with those in RenderLayer.
     const unsigned short DO_NOT_FORCE_COMPOSITED_SCROLLING = 0;
     const unsigned short COMPOSITED_SCROLLING_ALWAYS_ON = 1;
     const unsigned short COMPOSITED_SCROLLING_ALWAYS_OFF = 2;
     [RaisesException] void setNeedsCompositedScrolling(Element element, unsigned short value);
 
+    [RaisesException] boolean isScrollParent(Element child, Element parent);
+    [RaisesException] boolean isClipParent(Element child, Element parent);
+
+    [RaisesException] ClientRect scrollClip(Element element);
+    [RaisesException] ClientRect ancestorScrollClip(Element element);
+
     [RaisesException] DOMString scrollingStateTreeAsText(Document document);
     [RaisesException] DOMString mainThreadScrollingReasons(Document document);
     [RaisesException] ClientRectList nonFastScrollableRects(Document document);
 
     [RaisesException] DOMString repaintRectsAsText(Document document);
 
     [RaisesException] void garbageCollectDocumentResources(Document document);
     void evictAllResources();
 
     void allowRoundingHacks();
@@ skipping 56 matching lines @@
     void enableMockSpeechSynthesizer();
 
     [RaisesException] DOMString getImageSourceURL(Element element);
 
     boolean isSelectPopupVisible(Node node);
 
     [RaisesException] ClientRect selectionBounds();
 
     boolean loseSharedGraphicsContext3D();
 };