Handle nested theads correctly when paginated

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

 /*
  * Copyright (C) 2007 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 62 matching lines @@
     LayoutState(LayoutBox&, const LayoutSize& offset, LayoutUnit pageLogicalHeight = LayoutUnit(), bool pageHeightLogicalChanged = false, bool containingBlockLogicalWidthChanged = false);
 
     ~LayoutState();
 
     bool isPaginated() const { return m_isPaginated; }
 
     // The page logical offset is the object's offset from the top of the page in the page progression
     // direction (so an x-offset in vertical text and a y-offset for horizontal text).
     LayoutUnit pageLogicalOffset(const LayoutBox&, const LayoutUnit& childLogicalOffset) const;
 
+    LayoutUnit heightOffsetForTableHeaders() const { return m_heightOffsetForTableHeaders; };
+    void setHeightOffsetForTableHeaders(LayoutUnit offset) { m_heightOffsetForTableHeaders = offset; };
+
     const LayoutSize& layoutOffset() const { return m_layoutOffset; }
     const LayoutSize& pageOffset() const { return m_pageOffset; }
     LayoutUnit pageLogicalHeight() const { return m_pageLogicalHeight; }
     bool pageLogicalHeightChanged() const { return m_pageLogicalHeightChanged; }
     bool containingBlockLogicalWidthChanged() const { return m_containingBlockLogicalWidthChanged; }
 
     LayoutState* next() const { return m_next; }
 
     LayoutFlowThread* flowThread() const { return m_flowThread; }
 
     LayoutObject& layoutObject() const { return m_layoutObject; }
 
 private:
     // Do not add anything apart from bitfields until after m_flowThread. See https://bugs.webkit.org/show_bug.cgi?id=100173
     bool m_isPaginated : 1;
     // If our page height has changed, this will force all blocks to relayout.
     bool m_pageLogicalHeightChanged : 1;
     bool m_containingBlockLogicalWidthChanged : 1;
 
     LayoutFlowThread* m_flowThread;
 
     LayoutState* m_next;
 
     // x/y offset from container. Does not include relative positioning or scroll offsets.
     LayoutSize m_layoutOffset;
 
     // The current page height for the pagination model that encloses us.
     LayoutUnit m_pageLogicalHeight;
+
+    // The height we need to make available for repeating table headers in paginated layout.
+    LayoutUnit m_heightOffsetForTableHeaders;
+
     // The offset of the start of the first page in the nearest enclosing pagination model.
     LayoutSize m_pageOffset;
 
     LayoutObject& m_layoutObject;
 };
 
 } // namespace blink
 
 #endif // LayoutState_h