BR styled clear is ignored while partially relayouting.

Source/core/layout/line/LineLayoutState.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2014 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 24 matching lines @@
 public:
     LineLayoutState(bool fullLayout, LayoutUnit& paintInvalidationLogicalTop, LayoutUnit& paintInvalidationLogicalBottom, LayoutFlowThread* flowThread)
         : m_lastFloat(0)
         , m_endLine(0)
         , m_floatIndex(0)
         , m_endLineLogicalTop(0)
         , m_endLineMatched(false)
         , m_checkForFloatsFromLastLine(false)
         , m_hasInlineChild(false)
         , m_isFullLayout(fullLayout)
+        , m_containsClearBR(false)
         , m_paintInvalidationLogicalTop(paintInvalidationLogicalTop)
         , m_paintInvalidationLogicalBottom(paintInvalidationLogicalBottom)
         , m_adjustedLogicalLineTop(0)
         , m_usesPaintInvalidationBounds(false)
         , m_flowThread(flowThread)
     { }
 
     void markForFullLayout() { m_isFullLayout = true; }
     bool isFullLayout() const { return m_isFullLayout; }
 
@@ skipping 14 matching lines @@
 
     bool endLineMatched() const { return m_endLineMatched; }
     void setEndLineMatched(bool endLineMatched) { m_endLineMatched = endLineMatched; }
 
     bool checkForFloatsFromLastLine() const { return m_checkForFloatsFromLastLine; }
     void setCheckForFloatsFromLastLine(bool check) { m_checkForFloatsFromLastLine = check; }
 
     bool hasInlineChild() const { return m_hasInlineChild; }
     void setHasInlineChild(bool hasInlineChild) { m_hasInlineChild = hasInlineChild; }
 
+    bool containsClearBR() const { return m_containsClearBR; }

[leviw_travelin_and_unemployed, 2015/05/11 00:25:29]

Nit: I'd call this "containsBRWithClear" or "containsBRWithClearStyle"

[changseok, 2015/05/11 15:56:46]

containsBRWithClear sounds good to me. =)

+    void setContainsClearBR(bool containsBR) { m_containsClearBR = containsBR; }
+
     LineInfo& lineInfo() { return m_lineInfo; }
     const LineInfo& lineInfo() const { return m_lineInfo; }
 
     LayoutUnit endLineLogicalTop() const { return m_endLineLogicalTop; }
     void setEndLineLogicalTop(LayoutUnit logicalTop) { m_endLineLogicalTop = logicalTop; }
 
     RootInlineBox* endLine() const { return m_endLine; }
     void setEndLine(RootInlineBox* line) { m_endLine = line; }
 
     FloatingObject* lastFloat() const { return m_lastFloat; }
@@ skipping 18 matching lines @@
     unsigned m_floatIndex;
     LayoutUnit m_endLineLogicalTop;
     bool m_endLineMatched;
     bool m_checkForFloatsFromLastLine;
     // Used as a performance optimization to avoid doing a full paint invalidation when our floats
     // change but we don't have any inline children.
     bool m_hasInlineChild;
 
     bool m_isFullLayout;
 
+    bool m_containsClearBR;
+
     // FIXME: Should this be a range object instead of two ints?
     LayoutUnit& m_paintInvalidationLogicalTop;
     LayoutUnit& m_paintInvalidationLogicalBottom;
 
     LayoutUnit m_adjustedLogicalLineTop;
 
     bool m_usesPaintInvalidationBounds;
 
     LayoutFlowThread* m_flowThread;
 };
 
 }
 
 #endif // LineLayoutState_h