Report UseCounter metric when observing NotDef glyphs

third_party/WebKit/Source/core/css/CSSFontSelector.h

 /*
  * Copyright (C) 2007, 2008, 2011 Apple Inc. 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 32 matching lines @@
 
 class CORE_EXPORT CSSFontSelector : public FontSelector {
  public:
   static CSSFontSelector* Create(Document* document) {
     return new CSSFontSelector(document);
   }
   ~CSSFontSelector() override;
 
   unsigned Version() const override { return font_face_cache_.Version(); }
 
+  void ReportNotDefGlyph() const override;
+
   PassRefPtr<FontData> GetFontData(const FontDescription&,
                                    const AtomicString&) override;
   void WillUseFontData(const FontDescription&,
                        const AtomicString& family,
                        const String& text) override;
   void WillUseRange(const FontDescription&,
                     const AtomicString& family_name,
                     const FontDataForRangeSet&) override;
   bool IsPlatformFamilyMatchAvailable(const FontDescription&,
                                       const AtomicString& family);
@@ skipping 28 matching lines @@
   WeakMember<Document> document_;
   // FIXME: Move to Document or StyleEngine.
   FontFaceCache font_face_cache_;
   HeapHashSet<WeakMember<CSSFontSelectorClient>> clients_;
   GenericFontFamilySettings generic_font_family_settings_;
 };
 
 }  // namespace blink
 
 #endif  // CSSFontSelector_h