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

Source/WebCore/testing/Internals.h

Index: Source/WebCore/testing/Internals.h
diff --git a/Source/WebCore/testing/Internals.h b/Source/WebCore/testing/Internals.h
index 72d1634b918250e55a6f82e44d2e5708736e4b4a..5086f63c0224d7e7e00c6ca4b34df8d9c6c248f6 100644
--- a/Source/WebCore/testing/Internals.h
+++ b/Source/WebCore/testing/Internals.h
@@ -51,6 +51,7 @@ class InternalSettings;
 class Node;
 class Page;
 class PagePopupController;
+class PaintOrderLists;
 class Range;
 class ScriptExecutionContext;
 class ShadowRoot;
@@ -229,6 +230,10 @@ public:
     };
     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;