[css-flexbox] Only cache m_hasDefiniteHeight if we're inside of layoutBlock()

third_party/WebKit/Source/core/layout/LayoutFlexibleBox.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 236 matching lines @@
   // need an additional layout pass for correct stretch alignment handling, as
   // the first layout likely did not use the correct value for percentage
   // sizing of children.
   HashSet<const LayoutObject*> m_relaidOutChildren;
 
   mutable OrderIterator m_orderIterator;
   int m_numberOfInFlowChildrenOnFirstLine;
 
   // This is SizeIsUnknown outside of layoutBlock()
   mutable SizeDefiniteness m_hasDefiniteHeight;
+  bool m_inLayout;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutFlexibleBox, isFlexibleBox());
 
 }  // namespace blink
 
 #endif  // LayoutFlexibleBox_h