Move hit testing out of RenderLayer into RenderBox.

sky/engine/core/rendering/RenderLayerModelObject.cpp

Index: sky/engine/core/rendering/RenderLayerModelObject.cpp
diff --git a/sky/engine/core/rendering/RenderLayerModelObject.cpp b/sky/engine/core/rendering/RenderLayerModelObject.cpp
index 3540286b1d2c76f87f08bcc10f080b2664023b6d..27943e538445d610a9a004f2e34cc5e7f23753e5 100644
--- a/sky/engine/core/rendering/RenderLayerModelObject.cpp
+++ b/sky/engine/core/rendering/RenderLayerModelObject.cpp
@@ -62,6 +62,21 @@ bool RenderLayerModelObject::hasSelfPaintingLayer() const
     return m_layer && m_layer->isSelfPaintingLayer();
 }
 
+void RenderLayerModelObject::collectSelfPaintingLayers(Vector<RenderBox*>& layers)
+{
+    for (RenderObject* child = slowFirstChild(); child; child = child->nextSibling()) {
+        if (child->isBox()) {
+            RenderBox* childBox = toRenderBox(child);
+            if (childBox->hasSelfPaintingLayer())
+                layers.append(childBox);
+            else
+                childBox->collectSelfPaintingLayers(layers);
+        } else if (child->isLayerModelObject()) {
+            toRenderLayerModelObject(child)->collectSelfPaintingLayers(layers);
+        }
+    }
+}
+
 void RenderLayerModelObject::willBeDestroyed()
 {
     RenderObject::willBeDestroyed();