Allow touch adjustment to return Shadow DOM node.

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 32 matching lines @@
     [RaisesException] DOMString styleResolverStatsTotalsReport();
 
     [RaisesException] boolean isSharingStyle(Element element1, Element element2);
 
     [RaisesException] CSSStyleDeclaration computedStyleIncludingVisitedInfo(Node node);
 
     [RaisesException] ShadowRoot shadowRoot(Element host);
     [RaisesException] ShadowRoot youngestShadowRoot(Element host);
     [RaisesException] ShadowRoot oldestShadowRoot(Element host);
     [RaisesException] ShadowRoot youngerShadowRoot(Node root);
+    [RaisesException] Element shadowHost(Node node);
 
     [RaisesException] DOMString shadowRootType(Node root);
     [RaisesException] boolean hasShadowInsertionPoint(Node root);
     [RaisesException] boolean hasContentElement(Node root);
     [RaisesException] unsigned long countElementShadow(Node Root);
     [RaisesException] DOMString shadowPseudoId(Element element);
     [RaisesException] void setShadowPseudoId(Element element, DOMString id);
     [RaisesException] boolean isValidContentSelect(Element contentElement);
     [RaisesException] Node treeScopeRootNode(Node node);
     [RaisesException] Node parentTreeScope(Node node);
@@ skipping 232 matching lines @@
     [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);
 };