Add an intermediate function to generate 2 paint-order lists.

Source/WebCore/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 @@
     readonly attribute InternalSettings settings;
     readonly attribute unsigned long workerThreadCount;
 
     // Flags for layerTreeAsText.
     const unsigned short LAYER_TREE_INCLUDES_VISIBLE_RECTS = 1;
     const unsigned short LAYER_TREE_INCLUDES_TILE_CACHES = 2;
     const unsigned short LAYER_TREE_INCLUDES_REPAINT_RECTS = 4;
     const unsigned short LAYER_TREE_INCLUDES_PAINTING_PHASES = 8;
     DOMString layerTreeAsText(Document document, [Optional] unsigned short flags) raises (DOMException);
 
+    DOMString paintOrderListsAsText(in Element element) raises (DOMException);
+    PaintOrderLists paintOrderLists(in Element element) raises (DOMException);
+
     DOMString scrollingStateTreeAsText(Document document) raises (DOMException);
     DOMString mainThreadScrollingReasons(Document document) raises (DOMException);
     ClientRectList nonFastScrollableRects(Document document) raises (DOMException);
 
     DOMString repaintRectsAsText(Document document) raises (DOMException);
 
     void garbageCollectDocumentResources(Document document) raises (DOMException);
 
     void allowRoundingHacks();
 
@@ skipping 66 matching lines @@
     [Conditional=VIDEO] void simulateAudioInterruption(Node node);
 
     [Conditional=ENCRYPTED_MEDIA_V2] void initializeMockCDM();
 
     [Conditional=SPEECH_SYNTHESIS] void enableMockSpeechSynthesizer();
 
     DOMString getImageSourceURL(Element element) raises(DOMException);
 
     boolean isSelectPopupVisible(Node node);
 };