Add support for accelerated fixed root background

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 6464af19a76c427b594806c8fcdf26f476289c48..17abe5ef2ae07b44c837215e547fac86ce8f5738 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -1473,6 +1473,28 @@ String Internals::layerTreeAsText(Document* document, ExceptionCode& ec) const
     return layerTreeAsText(document, 0, ec);
 }
 
+String Internals::layerTreeAsText(Document* document, unsigned flags, ExceptionCode& ec) const
+{
+    if (!document || !document->frame()) {
+        ec = INVALID_ACCESS_ERR;
+        return String();
+    }
+
+    LayerTreeFlags layerTreeFlags = 0;
+    if (flags & LAYER_TREE_INCLUDES_VISIBLE_RECTS)
+        layerTreeFlags |= LayerTreeFlagsIncludeVisibleRects;
+    if (flags & LAYER_TREE_INCLUDES_TILE_CACHES)
+        layerTreeFlags |= LayerTreeFlagsIncludeTileCaches;
+    if (flags & LAYER_TREE_INCLUDES_REPAINT_RECTS)
+        layerTreeFlags |= LayerTreeFlagsIncludeRepaintRects;
+    if (flags & LAYER_TREE_INCLUDES_PAINTING_PHASES)
+        layerTreeFlags |= LayerTreeFlagsIncludePaintingPhases;
+    if (flags & LAYER_TREE_INCLUDES_ROOT_LAYER)
+        layerTreeFlags |= LayerTreeFlagsIncludeRootLayer;
+
+    return document->frame()->layerTreeAsText(layerTreeFlags);
+}
+
 static PassRefPtr<NodeList> paintOrderList(Element* element, ExceptionCode& ec, RenderLayer::PaintOrderListType type)
 {
     if (!element) {
@@ -1509,26 +1531,6 @@ PassRefPtr<NodeList> Internals::paintOrderListAfterPromote(Element* element, Exc
     return paintOrderList(element, ec, RenderLayer::AfterPromote);
 }
 
-String Internals::layerTreeAsText(Document* document, unsigned flags, ExceptionCode& ec) const
-{
-    if (!document || !document->frame()) {
-        ec = INVALID_ACCESS_ERR;
-        return String();
-    }
-
-    LayerTreeFlags layerTreeFlags = 0;
-    if (flags & LAYER_TREE_INCLUDES_VISIBLE_RECTS)
-        layerTreeFlags |= LayerTreeFlagsIncludeVisibleRects;
-    if (flags & LAYER_TREE_INCLUDES_TILE_CACHES)
-        layerTreeFlags |= LayerTreeFlagsIncludeTileCaches;
-    if (flags & LAYER_TREE_INCLUDES_REPAINT_RECTS)
-        layerTreeFlags |= LayerTreeFlagsIncludeRepaintRects;
-    if (flags & LAYER_TREE_INCLUDES_PAINTING_PHASES)
-        layerTreeFlags |= LayerTreeFlagsIncludePaintingPhases;
-
-    return document->frame()->layerTreeAsText(layerTreeFlags);
-}
-
 void Internals::setNeedsCompositedScrolling(Element* element, unsigned needsCompositedScrolling, ExceptionCode& ec)
 {
     if (!element) {