Underline Thickness is not uniform

Source/core/rendering/RootInlineBox.cpp

 /*
  * Copyright (C) 2003, 2006, 2008 Apple Inc. 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 157 matching lines @@
             && paintInfo.phase == PaintPhaseForeground)
         ellipsisBox()->paint(paintInfo, paintOffset, lineTop, lineBottom);
 }
 
 void RootInlineBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
 {
     InlineFlowBox::paint(paintInfo, paintOffset, lineTop, lineBottom);
     paintEllipsisBox(paintInfo, paintOffset, lineTop, lineBottom);
 }
 
+void RootInlineBox::paintDecorationStyle(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom, float decorationThickness)
+{
+    InlineFlowBox::paintDecorationStyle(paintInfo, paintOffset, lineTop, lineBottom, decorationThickness);
+}
+
+void RootInlineBox::getPaintDecorationSyle(PaintInfo& paintInfo, const LayoutPoint& paintOffset, float * decorationThickness)
+{
+    InlineFlowBox::getPaintDecorationSyle(paintInfo, paintOffset, decorationThickness);
+}
+
 bool RootInlineBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
 {
     if (hasEllipsisBox() && visibleToHitTestRequest(request)) {
         if (ellipsisBox()->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, lineTop, lineBottom)) {
             renderer().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
             return true;
         }
     }
     return InlineFlowBox::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, lineTop, lineBottom);
 }
@@ skipping 683 matching lines @@
 }
 
 #ifndef NDEBUG
 const char* RootInlineBox::boxName() const
 {
     return "RootInlineBox";
 }
 #endif
 
 } // namespace WebCore