Reland "Implement FullScreen using top layer."

third_party/WebKit/Source/core/layout/LayoutBlock.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBlock.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlock.cpp b/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
index 04c701c370f4fcc0f87c82d3f54ac3fae6a5d6d9..40e0758ad4cc1e7bea0695721513524a382f6874 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
@@ -258,10 +258,7 @@ void LayoutBlock::addChildBeforeDescendant(LayoutObject* newChild, LayoutObject*
 
     // If the requested insertion point is not one of our children, then this is because
     // there is an anonymous container within this object that contains the beforeDescendant.
-    if (beforeDescendantContainer->isAnonymousBlock()
-        // Full screen layoutObjects and full screen placeholders act as anonymous blocks, not tables:
-        || beforeDescendantContainer->isLayoutFullScreen()
-        || beforeDescendantContainer->isLayoutFullScreenPlaceholder()) {
+    if (beforeDescendantContainer->isAnonymousBlock()) {
         // Insert the child into the anonymous block box instead of here.
         if (newChild->isInline() || newChild->isFloatingOrOutOfFlowPositioned() || beforeDescendant->parent()->slowFirstChild() != beforeDescendant)
             beforeDescendant->parent()->addChild(newChild, beforeDescendant);