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

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

 /*
  * 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 115 matching lines @@
             ASSERT(!faceFontData->isSegmented());
             fontData->appendFace(FontDataForRangeSet(faceFontData.release(), (*it)->cssFontFace()->ranges()));
         }
     }
     if (fontData->numFaces())
         return fontData; // No release, we have a reference to an object in the cache which should retain the ref count it has.
 
     return nullptr;
 }
 
-void CSSSegmentedFontFace::willUseFontData(const FontDescription& fontDescription, UChar32 character)
+void CSSSegmentedFontFace::willUseFontData(const FontDescription& fontDescription, const String& text)
 {
     for (FontFaceList::reverse_iterator it = m_fontFaces.rbegin(); it != m_fontFaces.rend(); ++it) {
-        if ((*it)->loadStatus() != FontFace::Unloaded)
-            break;
-        if ((*it)->cssFontFace()->maybeScheduleFontLoad(fontDescription, character))
+        if ((*it)->willUseFontData(fontDescription, text))
             break;
     }
 }
 
 void CSSSegmentedFontFace::willUseRange(const blink::FontDescription& fontDescription, const blink::FontDataForRangeSet& rangeSet)
 {
     // Iterating backwards since later defined unicode-range faces override
     // previously defined ones, according to the CSS3 fonts module.
     // https://drafts.csswg.org/css-fonts/#composite-fonts
     for (FontFaceList::reverse_iterator it = m_fontFaces.rbegin(); it != m_fontFaces.rend(); ++it) {
@@ skipping 20 matching lines @@
     }
 }
 
 DEFINE_TRACE(CSSSegmentedFontFace)
 {
     visitor->trace(m_fontSelector);
     visitor->trace(m_fontFaces);
 }
 
 } // namespace blink