Linux: match average char width with Windows

skia/include/SkPaint.h

 /* include/graphics/SkPaint.h
 **
 ** Copyright 2006, Google Inc.
 **
 ** Licensed under the Apache License, Version 2.0 (the "License"); 
 ** you may not use this file except in compliance with the License. 
 ** You may obtain a copy of the License at 
 **
 **     http://www.apache.org/licenses/LICENSE-2.0 
 **
@@ skipping 569 matching lines @@
 
     void setTextEncoding(TextEncoding encoding);
 
     struct FontMetrics {
         SkScalar    fTop;       //!< The greatest distance above the baseline for any glyph (will be <= 0)
         SkScalar    fAscent;    //!< The recommended distance above the baseline (will be <= 0)
         SkScalar    fDescent;   //!< The recommended distance below the baseline (will be >= 0)
         SkScalar    fBottom;    //!< The greatest distance below the baseline for any glyph (will be >= 0)
         SkScalar    fLeading;   //!< The recommended distance to add between lines of text (will be >= 0)
         SkScalar    fHeight;    //!< the vertical distance between two consecutive baselines (>= 0)
+        SkScalar    fAvgCharWidth;  //!< the average charactor width (>= 0)
 
         // VDMX values are exact ascent and descent values for scalable fonts at
         // a certain pixel size.
         bool        fVDMXMetricsValid;  //!< If true, the following members are valid
         unsigned    fVDMXAscent;
         unsigned    fVDMXDescent;
     };
     
     /** Return the recommend spacing between lines (which will be
         fDescent - fAscent + fLeading).
@@ skipping 184 matching lines @@
 
     typedef SkPathEffect INHERITED;
 
     // illegal
     SkStrokePathEffect(const SkStrokePathEffect&);
     SkStrokePathEffect& operator=(const SkStrokePathEffect&);
 };
 
 #endif