Don't truncate the border-spacing before the table-header-group when fragmenting.

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

 /*
  * 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, 2008, 2009, 2010, 2013 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
@@ skipping 2049 matching lines @@
                                                 SubtreeLayoutScope& layouter) {
   row_object.SetPaginationStrut(LayoutUnit());
   row_object.SetLogicalHeight(LayoutUnit(LogicalHeightForRow(row_object)));
   int pagination_strut =
       PaginationStrutForRow(&row_object, row_object.LogicalTop());
   bool row_is_at_top_of_column = false;
   LayoutUnit offset_from_top_of_page;
   if (!pagination_strut) {
     LayoutUnit page_logical_height =
         PageLogicalHeightForOffset(row_object.LogicalTop());
-    if (page_logical_height && Table()->Header() &&
+    if (page_logical_height && Table()->Header() && Table()->Header() != this &&
         Table()->RowOffsetFromRepeatingHeader()) {
       offset_from_top_of_page =
           page_logical_height -
           PageRemainingLogicalHeightForOffset(row_object.LogicalTop(),
                                               kAssociateWithLatterPage);
       row_is_at_top_of_column =
           !offset_from_top_of_page ||
           offset_from_top_of_page <= Table()->VBorderSpacing();
     }
 
@@ skipping 86 matching lines @@
 bool LayoutTableSection::PaintedOutputOfObjectHasNoEffectRegardlessOfSize()
     const {
   // LayoutTableSection paints background from columns.
   if (Table()->HasColElements())
     return false;
   return LayoutTableBoxComponent::
       PaintedOutputOfObjectHasNoEffectRegardlessOfSize();
 }
 
 }  // namespace blink