[css-flexbox] Cache whether our main axis size is definite

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 81 matching lines @@
     enum ChildLayoutType {
         LayoutIfNeeded,
         ForceLayout,
         NeverLayout
     };
 
     enum class TransformedWritingMode {
         TopToBottomWritingMode, RightToLeftWritingMode, LeftToRightWritingMode, BottomToTopWritingMode
     };
 
+    enum class SizeDefiniteness {
+        Definite, Indefinite, Unknown
+    };
+
     struct FlexItem;
     struct LineContext;
 
     typedef Vector<FlexItem> OrderedFlexItemList;
     // Use an inline capacity of 8, since flexbox containers usually have less than 8 children.
     typedef Vector<LayoutRect, 8> ChildFrameRects;
 
     bool hasOrthogonalFlow(const LayoutBox& child) const;
     bool isColumnFlow() const;
     bool isLeftToRightFlow() const;
@@ skipping 81 matching lines @@
     // This is used to cache the preferred size for orthogonal flow children so we don't have to relayout to get it
     HashMap<const LayoutObject*, LayoutUnit> m_intrinsicSizeAlongMainAxis;
 
     // This set is used to keep track of which children we laid out in this current layout iteration.
     // We need it because the ones in this set may 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;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutFlexibleBox, isFlexibleBox());
 
 } // namespace blink
 
 #endif // LayoutFlexibleBox_h