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

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index 1f27d534a9eec3ee65c350f644347f498094440f..1c8a039fe7ac8a4e2d11ba1921cb6e1a0e081a7b 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -75,6 +75,7 @@
 #include "MockPagePopupDriver.h"
 #include "NodeRenderingContext.h"
 #include "Page.h"
+#include "PaintOrderLists.h"
 #include "PrintContext.h"
 #include "PseudoElement.h"
 #include "Range.h"
@@ -1546,6 +1547,54 @@ String Internals::layerTreeAsText(Document* document, ExceptionCode& ec) const
     return layerTreeAsText(document, 0, ec);
 }
 
+String Internals::paintOrderListsAsText(Element* element, ExceptionCode& ec)
+{
+    if (!element) {
+        ec = INVALID_ACCESS_ERR;
+        return String();
+    }
+
+    element->document()->updateLayout();
+
+    RenderObject* renderer = element->renderer();
+    if (!renderer || !renderer->isBox()) {
+        ec = INVALID_ACCESS_ERR;
+        return String();
+    }
+
+    RenderLayer* layer = toRenderBox(renderer)->layer();
+    if (!layer) {
+        ec = INVALID_ACCESS_ERR;
+        return String();
+    }
+
+    return layer->paintOrderListsAsText();
+}
+
+PassRefPtr<PaintOrderLists> Internals::paintOrderLists(Element* element, ExceptionCode& ec)
+{
+    if (!element) {
+        ec = INVALID_ACCESS_ERR;
+        return 0;
+    }
+
+    element->document()->updateLayout();
+
+    RenderObject* renderer = element->renderer();
+    if (!renderer || !renderer->isBox()) {
+        ec = INVALID_ACCESS_ERR;
+        return 0;
+    }
+
+    RenderLayer* layer = toRenderBox(renderer)->layer();
+    if (!layer) {
+        ec = INVALID_ACCESS_ERR;
+        return 0;
+    }
+
+    return layer->paintOrderLists();
+}
+
 String Internals::layerTreeAsText(Document* document, unsigned flags, ExceptionCode& ec) const
 {
     if (!document || !document->frame()) {