Remove background obscuration checks.

sky/engine/core/rendering/RenderBox.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007 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 61 matching lines @@
     virtual LayerType layerTypeRequired() const override
     {
         if (isPositioned() || createsGroup() || hasClipPath() || hasTransform() || hasHiddenBackface() || !style()->hasAutoZIndex())
             return NormalLayer;
         if (hasOverflowClip())
             return OverflowClipLayer;
 
         return NoLayer;
     }
 
-    virtual bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const override;
-
     // Use this with caution! No type checking is done!
     RenderBox* firstChildBox() const;
     RenderBox* lastChildBox() const;
 
     LayoutUnit x() const { return m_frameRect.x(); }
     LayoutUnit y() const { return m_frameRect.y(); }
     LayoutUnit width() const { return m_frameRect.width(); }
     LayoutUnit height() const { return m_frameRect.height(); }
 
     int pixelSnappedWidth() const { return m_frameRect.pixelSnappedWidth(); }
@@ skipping 382 matching lines @@
 
     bool hasSameDirectionAs(const RenderBox* object) const { return style()->direction() == object->style()->direction(); }
 
 protected:
     virtual void willBeDestroyed() override;
 
     virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) override;
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
     virtual void updateFromStyle() override;
 
-    // Returns false if it could not cheaply compute the extent (e.g. fixed background), in which case the returned rect may be incorrect.
-    bool getBackgroundPaintedExtent(LayoutRect&) const;
-    virtual bool foregroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect, unsigned maxDepthToTest) const;
-    virtual bool computeBackgroundIsKnownToBeObscured() override;
-
     void paintBackground(const PaintInfo&, const LayoutRect&, const Color& backgroundColor, BackgroundBleedAvoidance = BackgroundBleedNone);
 
     void paintFillLayer(const PaintInfo&, const Color&, const FillLayer&, const LayoutRect&, BackgroundBleedAvoidance, RenderObject* backgroundObject, bool skipBaseColor = false);
     void paintFillLayers(const PaintInfo&, const Color&, const FillLayer&, const LayoutRect&, BackgroundBleedAvoidance = BackgroundBleedNone, RenderObject* backgroundObject = 0);
 
     void paintMaskImages(const PaintInfo&, const LayoutRect&);
     void paintBoxDecorationBackgroundWithRect(PaintInfo&, const LayoutPoint&, const LayoutRect&);
 
     // Information extracted from RenderStyle for box painting.
     // These are always needed during box painting and recomputing them takes time.
@@ skipping 126 matching lines @@
         if (UNLIKELY(inlineBoxWrapper() != 0))
             deleteLineBoxWrapper();
     }
 
     ensureRareData().m_inlineBoxWrapper = boxWrapper;
 }
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_RENDERING_RENDERBOX_H_