Add grid/flex layout support for <fieldset>

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. 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
  * License as published by the Free Software Foundation; either
@@ skipping 1718 matching lines @@
 }
 
 LayoutBlock* LayoutBlock::createAnonymousWithParentAndDisplay(const LayoutObject* parent, EDisplay display)
 {
     // FIXME: Do we need to convert all our inline displays to block-type in the anonymous logic ?
     EDisplay newDisplay;
     LayoutBlock* newBox = nullptr;
     if (display == FLEX || display == INLINE_FLEX) {
         newBox = LayoutFlexibleBox::createAnonymous(&parent->document());
         newDisplay = FLEX;
+    } else if (display == GRID || display == INLINE_GRID) {
+        newBox = LayoutGrid::createAnonymous(&parent->document());
+        newDisplay = GRID;
     } else {
         newBox = LayoutBlockFlow::createAnonymous(&parent->document());
         newDisplay = BLOCK;
     }
 
     RefPtr<ComputedStyle> newStyle = ComputedStyle::createAnonymousStyleWithDisplay(parent->styleRef(), newDisplay);
     parent->updateAnonymousChildStyle(*newBox, *newStyle);
     newBox->setStyle(newStyle.release());
     return newBox;
 }
@@ skipping 118 matching lines @@
         for (TrackedLayoutBoxListHashSet::const_iterator it = positionedDescendantSet->begin(); it != end; ++it) {
             LayoutBox* currBox = *it;
             ASSERT(!currBox->needsLayout());
         }
     }
 }
 
 #endif
 
 } // namespace blink