Walk render tree instead of render layers for paint.

sky/engine/core/rendering/RenderText.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004-2009, 2013 Apple 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 136 matching lines @@
     void computePreferredLogicalWidths(float leadWidth);
     void computePreferredLogicalWidths(float leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow&);
 
     bool computeCanUseSimpleFontCodePath() const;
 
     // Make length() private so that callers that have a RenderText*
     // will use the more efficient textLength() instead, while
     // callers with a RenderObject* can continue to use length().
     virtual unsigned length() const override final { return textLength(); }
 
-    virtual void paint(PaintInfo&, const LayoutPoint&) override final { ASSERT_NOT_REACHED(); }
+    virtual void paint(PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers) override final { ASSERT_NOT_REACHED(); }
     virtual void layout() override final { ASSERT_NOT_REACHED(); }
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) override final { ASSERT_NOT_REACHED(); return false; }
 
     void deleteTextBoxes();
     bool containsOnlyWhitespace(unsigned from, unsigned len) const;
     float widthFromCache(const Font&, int start, int len, float xPos, TextDirection, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow*) const;
     bool isAllASCII() const { return m_isAllASCII; }
 
     bool isText() const = delete; // This will catch anyone doing an unnecessary check.
 
@@ skipping 47 matching lines @@
 #endif
 
 inline RenderText* Text::renderer() const
 {
     return toRenderText(CharacterData::renderer());
 }
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_RENDERING_RENDERTEXT_H_