[DO NOT COMMIT] Trace events for layout-based First Meaningful Paint detection

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

 /*
  * Copyright (C) 2008 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 49 matching lines @@
     void fontFaceInvalidated();
 
     void addFontFace(FontFace*, bool cssConnected);
     void removeFontFace(FontFace*);
     bool isEmpty() const { return m_fontFaces.isEmpty(); }
 
     PassRefPtr<FontData> getFontData(const FontDescription&);
 
     bool checkFont(const String&) const;
     void match(const String&, HeapVector<Member<FontFace>>&) const;
-    void willUseFontData(const FontDescription&, UChar32);
+    void willUseFontData(const FontDescription&, const String& text);
     void willUseRange(const FontDescription&, const blink::FontDataForRangeSet&);
 
     DECLARE_TRACE();
 
 private:
     CSSSegmentedFontFace(CSSFontSelector*, FontTraits);
 
     void pruneTable();
     bool isValid() const;
 
     using FontFaceList = HeapListHashSet<Member<FontFace>>;
 
     Member<CSSFontSelector> m_fontSelector;
     FontTraits m_traits;
     HashMap<unsigned, RefPtr<SegmentedFontData>> m_fontDataTable;
     // All non-CSS-connected FontFaces are stored after the CSS-connected ones.
     FontFaceList m_fontFaces;
     FontFaceList::iterator m_firstNonCssConnectedFace;
 };
 
 } // namespace blink
 
 #endif // CSSSegmentedFontFace_h