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

Source/core/testing/Internals.h

 /*
  * 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 34 matching lines @@
 class DOMWindow;
 class Document;
 class DocumentMarker;
 class Element;
 class Frame;
 class InspectorFrontendChannelDummy;
 class InternalSettings;
 class Node;
 class Page;
 class PagePopupController;
+class PaintOrderLists;
 class Range;
 class ScriptExecutionContext;
 class ShadowRoot;
 class MallocStatistics;
 class SerializedScriptValue;
 class TypeConversions;
 
 typedef int ExceptionCode;
 
 class Internals : public RefCounted<Internals>
@@ skipping 149 matching lines @@
 
     enum {
         // Values need to be kept in sync with Internals.idl.
         LAYER_TREE_INCLUDES_VISIBLE_RECTS = 1,
         LAYER_TREE_INCLUDES_TILE_CACHES = 2,
         LAYER_TREE_INCLUDES_REPAINT_RECTS = 4,
         LAYER_TREE_INCLUDES_PAINTING_PHASES = 8
     };
     String layerTreeAsText(Document*, unsigned flags, ExceptionCode&) const;
     String layerTreeAsText(Document*, ExceptionCode&) const;
+
+    String paintOrderListsAsText(Element* document, ExceptionCode& ec);
+    PassRefPtr<PaintOrderLists> paintOrderLists(Element* element, ExceptionCode& ec);
+
     String repaintRectsAsText(Document*, ExceptionCode&) const;
     String scrollingStateTreeAsText(Document*, ExceptionCode&) const;
     String mainThreadScrollingReasons(Document*, ExceptionCode&) const;
     PassRefPtr<ClientRectList> nonFastScrollableRects(Document*, ExceptionCode&) const;
 
     void garbageCollectDocumentResources(Document*, ExceptionCode&) const;
 
     void allowRoundingHacks() const;
 
     void insertAuthorCSS(Document*, const String&) const;
@@ skipping 72 matching lines @@
     Vector<String> iconURLs(Document*, int iconTypesMask) const;
 
     DocumentMarker* markerAt(Node*, const String& markerType, unsigned index, ExceptionCode&);
     RefPtr<DOMWindow> m_frontendWindow;
     OwnPtr<InspectorFrontendChannelDummy> m_frontendChannel;
 };
 
 } // namespace WebCore
 
 #endif