Report UseCounter metric when observing NotDef glyphs

third_party/WebKit/Source/platform/fonts/Font.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Holger Hans Peter Freyther
  *
  * 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
@@ skipping 179 matching lines @@
   // Whether the font supports shaping word by word instead of shaping the
   // full run in one go. Allows better caching for fonts where space cannot
   // participate in kerning and/or ligatures.
   bool CanShapeWordByWord() const;
 
   void SetCanShapeWordByWordForTesting(bool b) {
     can_shape_word_by_word_ = b;
     shape_word_by_word_computed_ = true;
   }
 
+  void ReportNotDefGlyph() const;
+
  private:
   enum ForTextEmphasisOrNot { kNotForTextEmphasis, kForTextEmphasis };
 
   GlyphData GetEmphasisMarkGlyphData(const AtomicString&) const;
 
   bool ComputeCanShapeWordByWord() const;
 
  public:
   FontSelector* GetFontSelector() const;
   PassRefPtr<FontFallbackIterator> CreateFontFallbackIterator(
@@ skipping 49 matching lines @@
   // advance an additional tab stop.
   if (distance_to_tab_stop < font_data->SpaceWidth() / 2)
     distance_to_tab_stop += base_tab_width;
 
   return distance_to_tab_stop;
 }
 
 }  // namespace blink
 
 #endif