Report UseCounter metric when observing NotDef glyphs

third_party/WebKit/Source/platform/testing/FontTestHelpers.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/testing/FontTestHelpers.h"
 
 #include "platform/fonts/Font.h"
 #include "platform/fonts/FontCustomPlatformData.h"
 #include "platform/fonts/FontDescription.h"
 #include "platform/fonts/FontSelector.h"
@@ skipping 28 matching lines @@
 
   void WillUseFontData(const FontDescription&,
                        const AtomicString& family_name,
                        const String& text) override {}
   void WillUseRange(const FontDescription&,
                     const AtomicString& family_name,
                     const FontDataForRangeSet&) override{};
 
   unsigned Version() const override { return 0; }
   void FontCacheInvalidated() override {}
+  void ReportNotDefGlyph() const override{};
 
  private:
   TestFontSelector(PassRefPtr<FontCustomPlatformData> custom_platform_data)
       : custom_platform_data_(std::move(custom_platform_data)) {}
 
   RefPtr<FontCustomPlatformData> custom_platform_data_;
 };
 
 }  // namespace
 
 Font CreateTestFont(const AtomicString& family_name,
                     const String& font_path,
                     float size) {
   FontFamily family;
   family.SetFamily(family_name);
 
   FontDescription font_description;
   font_description.SetFamily(family);
   font_description.SetSpecifiedSize(size);
   font_description.SetComputedSize(size);
 
   Font font(font_description);
   font.Update(TestFontSelector::Create(font_path));
   return font;
 }
 
 }  // namespace testing
 }  // namespace blink