Never layer-ize RenderInlines.

sky/engine/core/rendering/RenderInline.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 96 matching lines @@
     void generateLineBoxRects(GeneratorContext& yield) const;
     template<typename GeneratorContext>
     void generateCulledLineBoxRects(GeneratorContext& yield, const RenderInline* container) const;
 
     virtual void layout() override final { ASSERT_NOT_REACHED(); } // Do nothing for layout()
 
     virtual void paint(PaintInfo&, const LayoutPoint&, Vector<RenderBox*>& layers) override final;
 
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset) override final;
 
-    virtual LayerType layerTypeRequired() const override { return createsGroup() || hasClipPath() ? NormalLayer : NoLayer; }
+    virtual LayerType layerTypeRequired() const override { return NoLayer; }
 
     virtual LayoutUnit offsetLeft() const override final;
     virtual LayoutUnit offsetTop() const override final;
     virtual LayoutUnit offsetWidth() const override final { return linesBoundingBox().width(); }
     virtual LayoutUnit offsetHeight() const override final { return linesBoundingBox().height(); }
 
     virtual void mapLocalToContainer(const RenderLayerModelObject* paintInvalidationContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip) const override;
 
     virtual PositionWithAffinity positionForPoint(const LayoutPoint&) override final;
 
@@ skipping 16 matching lines @@
 
     RenderObjectChildList m_children;
     RenderLineBoxList m_lineBoxes;   // All of the line boxes created for this inline flow.  For example, <i>Hello<br>world.</i> will have two <i> line boxes.
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderInline, isRenderInline());
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_RENDERING_RENDERINLINE_H_