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

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 452 matching lines @@
         return true;
 
     if (!primaryFont())
         return false;
 
     const FontPlatformData& platformData = primaryFont()->platformData();
     TypesettingFeatures features = getFontDescription().getTypesettingFeatures();
     return !platformData.hasSpaceInLigaturesOrKerning(features);
 };
 
-void Font::willUseFontData(UChar32 character) const
+void Font::willUseFontData(const String& text) const
 {
     const FontFamily& family = getFontDescription().family();
     if (m_fontFallbackList && m_fontFallbackList->getFontSelector() && !family.familyIsEmpty())
-        m_fontFallbackList->getFontSelector()->willUseFontData(getFontDescription(), family.family(), character);
+        m_fontFallbackList->getFontSelector()->willUseFontData(getFontDescription(), family.family(), text);
 }
 
 static inline GlyphData glyphDataForNonCJKCharacterWithGlyphOrientation(UChar32 character, bool isUpright, GlyphData& data, unsigned pageNumber)
 {
     if (isUpright) {
         RefPtr<SimpleFontData> uprightFontData = data.fontData->uprightOrientationFontData();
         GlyphPageTreeNode* uprightNode = GlyphPageTreeNode::getNormalRootChild(uprightFontData.get(), pageNumber);
         GlyphPage* uprightPage = uprightNode->page();
         if (uprightPage) {
             GlyphData uprightData = uprightPage->glyphDataForCharacter(character);
@@ skipping 355 matching lines @@
 {
     return m_fontFallbackList && m_fontFallbackList->loadingCustomFonts();
 }
 
 bool Font::isFallbackValid() const
 {
     return !m_fontFallbackList || m_fontFallbackList->isValid();
 }
 
 } // namespace blink