Add DocumentTiming metrics for "time to first text paint"

Source/core/css/CSSFontSelector.cpp

 /*
  * Copyright (C) 2007, 2008, 2011 Apple Inc. All rights reserved.
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * 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
@@ skipping 130 matching lines @@
     return FontCache::fontCache()->getFontData(fontDescription, settingsFamilyName);
 }
 
 void CSSFontSelector::willUseFontData(const FontDescription& fontDescription, const AtomicString& family, UChar32 character)
 {
     CSSSegmentedFontFace* face = m_fontFaceCache.get(fontDescription, family);
     if (face)
         face->willUseFontData(fontDescription, character);
 }
 
+void CSSFontSelector::reportFirstCustomFontText()
+{
+    m_document->markFirstCustomFontText();
+}
+
+void CSSFontSelector::reportFirstNonBlankText()
+{
+    m_document->markFirstNonBlankText();
+}
+
 bool CSSFontSelector::isPlatformFontAvailable(const FontDescription& fontDescription, const AtomicString& passedFamily)
 {
     AtomicString family = familyNameFromSettings(m_genericFontFamilySettings, fontDescription, passedFamily);
     if (family.isEmpty())
         family = passedFamily;
     return FontCache::fontCache()->isPlatformFontAvailable(fontDescription, family);
 }
 
 #if !ENABLE(OILPAN)
 void CSSFontSelector::clearDocument()
@@ skipping 18 matching lines @@
 #if ENABLE(OILPAN)
     visitor->trace(m_document);
     visitor->trace(m_fontFaceCache);
     visitor->trace(m_clients);
     visitor->trace(m_fontLoader);
 #endif
     FontSelector::trace(visitor);
 }
 
 }