Support the essential part of Shadow DOM v1

third_party/WebKit/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.
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     // Advances an animated image. For BitmapImage (e.g., animated gifs) this
     // will advance to the next frame. For SVGImage, this will trigger an
     // animation update for CSS and advance the SMIL timeline by one frame.
     [RaisesException] void advanceImageAnimation(Element image);
 
     [RaisesException] Node nextSiblingInComposedTree(Node node);
     [RaisesException] Node firstChildInComposedTree(Node node);
     [RaisesException] Node lastChildInComposedTree(Node node);
     [RaisesException] Node nextInComposedTree(Node node);
     [RaisesException] Node previousInComposedTree(Node node);
+    [RaisesException] Node parentInComposedTree(Node node);
 
     DOMString visiblePlaceholder(Element element);
 
     void selectColorInColorChooser(Element element, DOMString colorValue);
     void endColorChooser(Element element);
 
     // If the argument is omitted, the top-level document is used.
     boolean hasAutofocusRequest(optional Document document);
     [RaisesException] DOMString[] formControlStateOfHistoryItem();
     [RaisesException] void setFormControlStateOfHistoryItem(sequence<DOMString> values);
@@ skipping 252 matching lines @@
     bool setScrollbarVisibilityInScrollableArea(Node node, boolean visible);
 
     void forceRestrictIFramePermissions();
     [RaisesException] double monotonicTimeToZeroBasedDocumentTime(double platformTime);
 
     void setMediaElementNetworkState(HTMLMediaElement element, long state);
 
     // TODO(liberato): remove once autoplay gesture override experiment concludes.
     void triggerAutoplayViewportCheck(HTMLMediaElement mediaElement);
 };