Report UseCounter metric when observing NotDef glyphs

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

 /*
  * Copyright (C) 2007, 2008, 2011 Apple Inc. All rights reserved.
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * 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 16 matching lines @@
 #include "core/css/CSSFontSelector.h"
 
 #include "core/css/CSSFontSelectorClient.h"
 #include "core/css/CSSSegmentedFontFace.h"
 #include "core/css/CSSValueList.h"
 #include "core/css/FontFaceSet.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
+#include "core/frame/UseCounter.h"
 #include "core/loader/FrameLoader.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/fonts/SimpleFontData.h"
 #include "platform/wtf/text/AtomicString.h"
 
 namespace blink {
 
 CSSFontSelector::CSSFontSelector(Document* document)
     : document_(document),
@@ skipping 119 matching lines @@
 }
 
 void CSSFontSelector::UpdateGenericFontFamilySettings(Document& document) {
   if (!document.GetSettings())
     return;
   generic_font_family_settings_ =
       document.GetSettings()->GetGenericFontFamilySettings();
   FontCacheInvalidated();
 }
 
+void CSSFontSelector::ReportNotDefGlyph() const {
+  DCHECK(document_);
+  UseCounter::Count(document_, UseCounter::kFontShapingNotDefGlyphObserved);
+}
+
 DEFINE_TRACE(CSSFontSelector) {
   visitor->Trace(document_);
   visitor->Trace(font_face_cache_);
   visitor->Trace(clients_);
   FontSelector::Trace(visitor);
 }
 
 }  // namespace blink