Fixup a bug about SVG text selection.

Source/platform/geometry/FloatRect.h

 /*
  * Copyright (C) 2003, 2006, 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2005 Nokia.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 114 matching lines @@
     void shiftMaxYEdgeTo(float edge)
     {
         float delta = edge - maxY();
         setHeight(std::max(0.0f, height() + delta));
     }
 
     FloatPoint minXMinYCorner() const { return m_location; } // typically topLeft
     FloatPoint maxXMinYCorner() const { return FloatPoint(m_location.x() + m_size.width(), m_location.y()); } // typically topRight
     FloatPoint minXMaxYCorner() const { return FloatPoint(m_location.x(), m_location.y() + m_size.height()); } // typically bottomLeft
     FloatPoint maxXMaxYCorner() const { return FloatPoint(m_location.x() + m_size.width(), m_location.y() + m_size.height()); } // typically bottomRight
+    FloatPoint leftEdgeMidPoint() const { return FloatPoint(m_location.x(), m_location.y() + m_size.height() / 2); }
+    FloatPoint rightEdgeMidPoint() const { return FloatPoint(m_location.x() + m_size.width(), m_location.y() +  m_size.height() / 2); }
 
     bool intersects(const FloatRect&) const;
     bool contains(const FloatRect&) const;
     bool contains(const FloatPoint&, ContainsMode = InsideOrOnStroke) const;
 
     void intersect(const FloatRect&);
     void unite(const FloatRect&);
     void uniteEvenIfEmpty(const FloatRect&);
     void uniteIfNonZero(const FloatRect&);
     void extend(const FloatPoint&);
@@ skipping 96 matching lines @@
 PLATFORM_EXPORT IntRect enclosedIntRect(const FloatRect&);
 
 PLATFORM_EXPORT IntRect roundedIntRect(const FloatRect&);
 
 // Map supplied rect from srcRect to an equivalent rect in destRect.
 PLATFORM_EXPORT FloatRect mapRect(const FloatRect&, const FloatRect& srcRect, const FloatRect& destRect);
 
 }
 
 #endif