Repeating header groups should align properly when captions are present

third_party/WebKit/Source/core/layout/LayoutTable.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, 2007, 2008, 2009, 2010, 2013 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
@@ skipping 1453 matching lines @@
 LayoutTableCell* LayoutTable::cellAfter(const LayoutTableCell* cell) const {
   recalcSectionsIfNeeded();
 
   unsigned effCol = absoluteColumnToEffectiveColumn(
       cell->absoluteColumnIndex() + cell->colSpan());
   if (effCol >= numEffectiveColumns())
     return nullptr;
   return cell->section()->primaryCellAt(cell->rowIndex(), effCol);
 }
 
+LayoutTableCaption* LayoutTable::topCaption() const {
+  for (auto& caption : m_captions) {
+    if (caption->style()->captionSide() == ECaptionSide::Top)

[mstensho (USE GERRIT), 2016/10/17 19:21:13]

There may be more than one top caption.

+      return caption;
+  }
+  return nullptr;
+}
+
 int LayoutTable::baselinePosition(FontBaseline baselineType,
                                   bool firstLine,
                                   LineDirectionMode direction,
                                   LinePositionMode linePositionMode) const {
   ASSERT(linePositionMode == PositionOnContainingLine);
   int baseline = firstLineBoxBaseline();
   if (baseline != -1) {
     if (isInline())
       return beforeMarginInLineDirection(direction) + baseline;
     return baseline;
@@ skipping 176 matching lines @@
 }
 
 LayoutUnit LayoutTable::paddingRight() const {
   if (collapseBorders())
     return LayoutUnit();
 
   return LayoutBlock::paddingRight();
 }
 
 }  // namespace blink