Statistics of LayoutBox rare data reasons

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003-2013 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ skipping 664 matching lines @@
         : m_margins(positiveMarginBeforeDefault(block),
                     negativeMarginBeforeDefault(block),
                     positiveMarginAfterDefault(block),
                     negativeMarginAfterDefault(block)),
           m_multiColumnFlowThread(nullptr),
           m_breakBefore(static_cast<unsigned>(EBreakBetween::kAuto)),
           m_breakAfter(static_cast<unsigned>(EBreakBetween::kAuto)),
           m_lineBreakToAvoidWidow(-1),
           m_didBreakAtLineToAvoidWidow(false),
           m_discardMarginBefore(false),
-          m_discardMarginAfter(false) {}
+          m_discardMarginAfter(false) {
+      block->m_rareStat.addReason(ReasonLBFRareData);
+    }
 
     static LayoutUnit positiveMarginBeforeDefault(
         const LayoutBlockFlow* block) {
       return block->marginBefore().clampNegativeToZero();
     }
     static LayoutUnit negativeMarginBeforeDefault(
         const LayoutBlockFlow* block) {
       return (-block->marginBefore()).clampNegativeToZero();
     }
     static LayoutUnit positiveMarginAfterDefault(const LayoutBlockFlow* block) {
@@ skipping 257 matching lines @@
   void positionDialog();
 
   // END METHODS DEFINED IN LayoutBlockFlowLine
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBlockFlow, isLayoutBlockFlow());
 
 }  // namespace blink
 
 #endif  // LayoutBlockFlow_h