Avoid pathological layout on nested percent height tables

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

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2009, 2010 Apple Inc.
  *               All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 24 matching lines @@
 
 namespace blink {
 
 class LayoutTableCol;
 class LayoutTableCaption;
 class LayoutTableCell;
 class LayoutTableSection;
 class TableLayoutAlgorithm;
 
 enum SkipEmptySectionsValue { DoNotSkipEmptySections, SkipEmptySections };
+enum TableHeightChangingValue { TableHeightNotChanging, TableHeightChanging };
 
 // LayoutTable is the LayoutObject associated with
 // display: table or inline-table.
 //
 // LayoutTable is the master coordinator for determining the overall table
 // structure. The reason is that LayoutTableSection children have a local
 // view over what their structure is but don't account for other
 // LayoutTableSection. Thus LayoutTable helps keep consistency across
 // LayoutTableSection. See e.g. |m_effectiveColumns| below.
 //
@@ skipping 453 matching lines @@
   LayoutRect overflowClipRect(
       const LayoutPoint& location,
       OverlayScrollbarClipBehavior = IgnoreOverlayScrollbarSize) const override;
 
   void addOverflowFromChildren() override;
 
   void recalcSections() const;
   void layoutCaption(LayoutTableCaption&, SubtreeLayoutScope&);
   void layoutSection(LayoutTableSection&,
                      SubtreeLayoutScope&,
-                     LayoutUnit logicalLeft);
+                     LayoutUnit logicalLeft,
+                     TableHeightChangingValue);
 
   // Return the logical height based on the height, min-height and max-height
   // properties from CSS. Will return 0 if auto.
   LayoutUnit logicalHeightFromStyle() const;
 
   void distributeExtraLogicalHeight(int extraLogicalHeight);
 
   void recalcCollapsedBordersIfNeeded();
 
   // TODO(layout-dev): All mutables in this class are lazily updated by
@@ skipping 63 matching lines @@
     return numEffectiveColumns();
   }
 
   short m_hSpacing;
   short m_vSpacing;
   int m_borderStart;
   int m_borderEnd;
 
   LayoutUnit m_blockOffsetToFirstRepeatableHeader;
   LayoutUnit m_rowOffsetFromRepeatingHeader;
+  LayoutUnit m_oldAvailableLogicalHeight;
 };
 
 inline LayoutTableSection* LayoutTable::topSection() const {
   ASSERT(!needsSectionRecalc());
   if (m_head)
     return m_head;
   if (m_firstBody)
     return m_firstBody;
   return m_foot;
 }
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTable, isTable());
 
 }  // namespace blink
 
 #endif  // LayoutTable_h