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

third_party/WebKit/Source/core/layout/LayoutText.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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 186 matching lines @@
     const ComputedStyle& newStyle = styleRef();
     ETextTransform oldTransform = oldStyle ? oldStyle->textTransform() : TTNONE;
     ETextSecurity oldSecurity = oldStyle ? oldStyle->textSecurity() : TSNONE;
     if (oldTransform != newStyle.textTransform() || oldSecurity != newStyle.textSecurity())
         transformText();
 
     // This is an optimization that kicks off font load before layout.
     // In order to make it fast, we only check if the first character of the
     // text is included in the unicode ranges of the fonts.
     if (!text().containsOnlyWhitespace())
-        newStyle.font().willUseFontData(text().characterStartingAt(0));
+        newStyle.font().willUseFontData(text());
 }
 
 void LayoutText::removeAndDestroyTextBoxes()
 {
     if (!documentBeingDestroyed()) {
         if (firstTextBox()) {
             if (isBR()) {
                 RootInlineBox* next = firstTextBox()->root().nextRootBox();
                 if (next)
                     next->markDirty();
@@ skipping 1481 matching lines @@
     for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
         paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*box, invalidationReason);
         if (box->truncation() != cNoTruncation) {
             if (EllipsisBox* ellipsisBox = box->root().ellipsisBox())
                 paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*ellipsisBox, invalidationReason);
         }
     }
 }
 
 } // namespace blink