Statistics of LayoutBox rare data reasons

third_party/WebKit/Source/core/layout/LayoutTableCell.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 Apple Inc.
  *               All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 48 matching lines @@
 LayoutTableCell::LayoutTableCell(Element* element)
     : LayoutBlockFlow(element),
       m_absoluteColumnIndex(unsetColumnIndex),
       m_cellWidthChanged(false),
       m_intrinsicPaddingBefore(0),
       m_intrinsicPaddingAfter(0) {
   // We only update the flags when notified of DOM changes in
   // colSpanOrRowSpanChanged() so we need to set their initial values here in
   // case something asks for colSpan()/rowSpan() before then.
   updateColAndRowSpanFlags();
+  m_rareStat.addReason(ReasonLTCAll);
 }
 
 LayoutTableCell::CollapsedBorderValues::CollapsedBorderValues(
     const LayoutTableCell& layoutTableCell,
     const CollapsedBorderValue& startBorder,
     const CollapsedBorderValue& endBorder,
     const CollapsedBorderValue& beforeBorder,
     const CollapsedBorderValue& afterBorder)
     : m_layoutTableCell(layoutTableCell),
       m_startBorder(startBorder),
@@ skipping 1285 matching lines @@
   if (changed) {
     ObjectPaintInvalidator(*table())
         .slowSetPaintingLayerNeedsRepaintAndInvalidateDisplayItemClient(
             *this, PaintInvalidationStyleChange);
   }
 
   addBorderStyle(borderValues, newValues.startBorder());
   addBorderStyle(borderValues, newValues.endBorder());
   addBorderStyle(borderValues, newValues.beforeBorder());
   addBorderStyle(borderValues, newValues.afterBorder());
+
+  m_rareStat.addReason(ReasonLTCCollapsedBorders);
+  if (!newValues.startBorder().isVisible() &&
+      !newValues.endBorder().isVisible() &&
+      !newValues.beforeBorder().isVisible() &&
+      !newValues.afterBorder().isVisible())
+    m_rareStat.addReason(ReasonLTCInvisibleCollapsedBorders);
 }
 
 void LayoutTableCell::sortBorderValues(
     LayoutTable::CollapsedBorderValues& borderValues) {
   std::sort(borderValues.begin(), borderValues.end(), compareBorders);
 }
 
 void LayoutTableCell::paintBoxDecorationBackground(
     const PaintInfo& paintInfo,
     const LayoutPoint& paintOffset) const {
@@ skipping 114 matching lines @@
 }
 
 bool LayoutTableCell::hasLineIfEmpty() const {
   if (node() && hasEditableStyle(*node()))
     return true;
 
   return LayoutBlock::hasLineIfEmpty();
 }
 
 }  // namespace blink