[WIP] Adding support for <iframe>s to slimming paint.

Source/core/rendering/compositing/CompositedLayerMapping.cpp

Index: Source/core/rendering/compositing/CompositedLayerMapping.cpp
diff --git a/Source/core/rendering/compositing/CompositedLayerMapping.cpp b/Source/core/rendering/compositing/CompositedLayerMapping.cpp
index 157a02d074210fcd5d45aa45fc72f5ccd6b072fb..fa4f11d8e79f9e104483db67fea8d8f58a48fabc 100644
--- a/Source/core/rendering/compositing/CompositedLayerMapping.cpp
+++ b/Source/core/rendering/compositing/CompositedLayerMapping.cpp
@@ -2158,8 +2158,8 @@ void CompositedLayerMapping::doPaintTask(const GraphicsLayerPaintInfo& paintInfo
             context->fillRect(dirtyRect, Color(0xFF, 0, 0));
 #endif
 
-            if (RenderView* view = paintInfo.renderLayer->renderer()->view()) {
-                const PaintList& paintList = view->viewDisplayList().paintList();
+            if (paintInfo.renderLayer->renderer()->view()) {
+                const PaintList& paintList = ViewDisplayList::fromRenderLayer(paintInfo.renderLayer).paintList();
                 for (PaintList::const_iterator it = paintList.begin(); it != paintList.end(); ++it)
                     (*it)->replay(context);
             }