Implement FullScreen using top layer.

Source/core/layout/LayoutObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 364 matching lines @@
     bool isLayoutTableCol() const { return isOfType(LayoutObjectLayoutTableCol); }
     bool isListBox() const { return isOfType(LayoutObjectListBox); }
     bool isListItem() const { return isOfType(LayoutObjectListItem); }
     bool isListMarker() const { return isOfType(LayoutObjectListMarker); }
     bool isMedia() const { return isOfType(LayoutObjectMedia); }
     bool isMenuList() const { return isOfType(LayoutObjectMenuList); }
     bool isMeter() const { return isOfType(LayoutObjectMeter); }
     bool isProgress() const { return isOfType(LayoutObjectProgress); }
     bool isQuote() const { return isOfType(LayoutObjectQuote); }
     bool isLayoutButton() const { return isOfType(LayoutObjectLayoutButton); }
-    bool isLayoutFullScreen() const { return isOfType(LayoutObjectLayoutFullScreen); }
-    bool isLayoutFullScreenPlaceholder() const { return isOfType(LayoutObjectLayoutFullScreenPlaceholder); }
     bool isLayoutGrid() const { return isOfType(LayoutObjectLayoutGrid); }
     bool isLayoutIFrame() const { return isOfType(LayoutObjectLayoutIFrame); }
     bool isLayoutImage() const { return isOfType(LayoutObjectLayoutImage); }
     bool isLayoutMultiColumnSet() const { return isOfType(LayoutObjectLayoutMultiColumnSet); }
     bool isLayoutMultiColumnSpannerPlaceholder() const { return isOfType(LayoutObjectLayoutMultiColumnSpannerPlaceholder); }
     bool isLayoutScrollbarPart() const { return isOfType(LayoutObjectLayoutScrollbarPart); }
     bool isLayoutView() const { return isOfType(LayoutObjectLayoutView); }
     bool isReplica() const { return isOfType(LayoutObjectReplica); }
     bool isRuby() const { return isOfType(LayoutObjectRuby); }
     bool isRubyBase() const { return isOfType(LayoutObjectRubyBase); }
@@ skipping 126 matching lines @@
     // rest of the layout tree will move to a similar model.
     virtual bool nodeAtFloatPoint(HitTestResult&, const FloatPoint& pointInParent, HitTestAction);
 
     bool isAnonymous() const { return m_bitfields.isAnonymous(); }
     bool isAnonymousBlock() const
     {
         // This function is kept in sync with anonymous block creation conditions in
         // LayoutBlock::createAnonymousBlock(). This includes creating an anonymous
         // LayoutBlock having a BLOCK or BOX display. Other classes such as LayoutTextFragment
         // are not LayoutBlocks and will return false. See https://bugs.webkit.org/show_bug.cgi?id=56709.
-        return isAnonymous() && (style()->display() == BLOCK || style()->display() == BOX) && style()->styleType() == NOPSEUDO && isLayoutBlock() && !isListMarker() && !isLayoutFlowThread() && !isLayoutMultiColumnSet()
-            && !isLayoutFullScreen()
-            && !isLayoutFullScreenPlaceholder();
+        return isAnonymous() && (style()->display() == BLOCK || style()->display() == BOX) && style()->styleType() == NOPSEUDO && isLayoutBlock() && !isListMarker() && !isLayoutFlowThread() && !isLayoutMultiColumnSet();
     }
     bool isElementContinuation() const { return node() && node()->layoutObject() != this; }
     bool isInlineElementContinuation() const { return isElementContinuation() && isInline(); }
     virtual LayoutBoxModelObject* virtualContinuation() const { return nullptr; }
 
     bool isFloating() const { return m_bitfields.floating(); }
 
     bool isOutOfFlowPositioned() const { return m_bitfields.isOutOfFlowPositioned(); } // absolute or fixed positioning
     bool isInFlowPositioned() const { return m_bitfields.isInFlowPositioned(); } // relative or sticky positioning
     bool isRelPositioned() const { return m_bitfields.isRelPositioned(); } // relative positioning
@@ skipping 635 matching lines @@
         LayoutObjectListBox,
         LayoutObjectListItem,
         LayoutObjectListMarker,
         LayoutObjectMedia,
         LayoutObjectMenuList,
         LayoutObjectMeter,
         LayoutObjectProgress,
         LayoutObjectQuote,
         LayoutObjectLayoutButton,
         LayoutObjectLayoutFlowThread,
-        LayoutObjectLayoutFullScreen,
-        LayoutObjectLayoutFullScreenPlaceholder,
         LayoutObjectLayoutGrid,
         LayoutObjectLayoutIFrame,
         LayoutObjectLayoutImage,
         LayoutObjectLayoutInline,
         LayoutObjectLayoutMultiColumnSet,
         LayoutObjectLayoutMultiColumnSpannerPlaceholder,
         LayoutObjectLayoutPart,
         LayoutObjectLayoutScrollbarPart,
         LayoutObjectLayoutView,
         LayoutObjectReplica,
@@ skipping 651 matching lines @@
 void showTree(const blink::LayoutObject*);
 void showLineTree(const blink::LayoutObject*);
 void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 void showLayoutTree(const blink::LayoutObject* object1, const blink::LayoutObject* object2);
 
 #endif
 
 #endif // LayoutObject_h