Implement FullScreen using top layer.

Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1959 matching lines @@
 void LayoutObject::propagateStyleToAnonymousChildren(bool blockChildrenOnly)
 {
     // FIXME: We could save this call when the change only affected non-inherited properties.
     for (LayoutObject* child = slowFirstChild(); child; child = child->nextSibling()) {
         if (!child->isAnonymous() || child->style()->styleType() != NOPSEUDO)
             continue;
 
         if (blockChildrenOnly && !child->isLayoutBlock())
             continue;
 
-        if (child->isLayoutFullScreen() || child->isLayoutFullScreenPlaceholder())
-            continue;
-
         RefPtr<ComputedStyle> newStyle = ComputedStyle::createAnonymousStyleWithDisplay(styleRef(), child->style()->display());
 
         // Preserve the position style of anonymous block continuations as they can have relative position when
         // they contain block descendants of relative positioned inlines.
         if (child->isInFlowPositioned() && toLayoutBlock(child)->isAnonymousBlockContinuation())
             newStyle->setPosition(child->style()->position());
 
         updateAnonymousChildStyle(*child, *newStyle);
 
         child->setStyle(newStyle.release());
@@ skipping 1386 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif