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

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

 /*
  * Copyright (C) 2007, 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 44 matching lines @@
     }
 
     FontFace* fontFace() const { return m_fontFace; }
 
     PassRefPtr<UnicodeRangeSet> ranges() { return m_ranges; }
 
     void setSegmentedFontFace(CSSSegmentedFontFace*);
     void clearSegmentedFontFace() { m_segmentedFontFace = nullptr; }
 
     bool isValid() const { return !m_sources.isEmpty(); }
+    bool isBlank() const;
 
     void addSource(CSSFontFaceSource*);
 
     void didBeginLoad();
     void fontLoaded(RemoteFontFaceSource*);
     void didBecomeVisibleFallback(RemoteFontFaceSource*);
 
     PassRefPtr<SimpleFontData> getFontData(const FontDescription&);
 
     FontFace::LoadStatusType loadStatus() const { return m_fontFace->loadStatus(); }
@@ skipping 11 matching lines @@
 
     RefPtr<UnicodeRangeSet> m_ranges;
     Member<CSSSegmentedFontFace> m_segmentedFontFace;
     HeapDeque<Member<CSSFontFaceSource>> m_sources;
     Member<FontFace> m_fontFace;
 };
 
 } // namespace blink
 
 #endif