Replace RenderFullScreen with top layer

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index aff399f4b84719b13b22ab2811853fd989851923..ea5366af2507d4570331f2d4bd273a83b3975d1a 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -2793,7 +2793,7 @@ bool Element::needsPseudoElement(PseudoId pseudoId, const RenderStyle& style) co
         return false;
     if (!renderer() || !pseudoElementRendererIsNeeded(&style))
         return false;
-    if (!renderer()->canHaveGeneratedChildren())
+    if (pseudoId != BACKDROP && !renderer()->canHaveGeneratedChildren())

[esprehn, 2014/01/23 18:44:58]

This is not safe, renderers that return false from canHaveGeneratedChildren() do
so because having them would lead to crashes or security bugs.

[falken, 2014/01/24 01:50:44]

Added a comment.

         return false;
     return true;
 }