Reland "Implement FullScreen using top layer."

third_party/WebKit/Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 1779 matching lines @@
     m_layoutSubtreeRootList.remove(const_cast<LayoutObject&>(root));
 }
 
 void FrameView::clearLayoutSubtreeRootsAndMarkContainingBlocks()
 {
     m_layoutSubtreeRootList.clearAndMarkContainingBlocksForLayout();
 }
 
 void FrameView::addOrthogonalWritingModeRoot(LayoutBox& root)
 {
-    ASSERT(!root.isLayoutFullScreen() && !root.isLayoutFullScreenPlaceholder()
-        && !root.isLayoutScrollbarPart());
+    DCHECK(!root.isLayoutScrollbarPart());
     m_orthogonalWritingModeRootList.add(root);
 }
 
 void FrameView::removeOrthogonalWritingModeRoot(LayoutBox& root)
 {
     m_orthogonalWritingModeRootList.remove(root);
 }
 
 bool FrameView::hasOrthogonalWritingModeRoots() const
 {
@@ skipping 2461 matching lines @@
 }
 
 bool FrameView::canThrottleRendering() const
 {
     if (!RuntimeEnabledFeatures::renderingPipelineThrottlingEnabled())
         return false;
     return m_subtreeThrottled || (m_hiddenForThrottling && m_crossOriginForThrottling);
 }
 
 } // namespace blink