Report UseCounter metric when observing NotDef glyphs

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (c) 2007, 2008, 2010 Google Inc. All rights reserved.
  *
  * 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 393 matching lines @@
     return true;
 
   if (!PrimaryFont())
     return false;
 
   const FontPlatformData& platform_data = PrimaryFont()->PlatformData();
   TypesettingFeatures features = GetFontDescription().GetTypesettingFeatures();
   return !platform_data.HasSpaceInLigaturesOrKerning(features);
 };
 
+void Font::ReportNotDefGlyph() const {
+  FontSelector* fontSelector = font_fallback_list_->GetFontSelector();
+  // We have a few non-DOM usages of Font code, for example in DragImage::Create
+  // and in EmbeddedObjectPainter::paintReplaced. In those cases, we can't
+  // retrieve a font selector as our connection to a Document object to report
+  // UseCounter metrics, and thus we cannot report notdef glyphs.
+  if (fontSelector)
+    fontSelector->ReportNotDefGlyph();
+}
+
 void Font::WillUseFontData(const String& text) const {
   const FontFamily& family = GetFontDescription().Family();
   if (font_fallback_list_ && font_fallback_list_->GetFontSelector() &&
       !family.FamilyIsEmpty())
     font_fallback_list_->GetFontSelector()->WillUseFontData(
         GetFontDescription(), family.Family(), text);
 }
 
 PassRefPtr<FontFallbackIterator> Font::CreateFontFallbackIterator(
     FontFallbackPriority fallback_priority) const {
@@ skipping 65 matching lines @@
 
 bool Font::LoadingCustomFonts() const {
   return font_fallback_list_ && font_fallback_list_->LoadingCustomFonts();
 }
 
 bool Font::IsFallbackValid() const {
   return !font_fallback_list_ || font_fallback_list_->IsValid();
 }
 
 }  // namespace blink