Implement InterpolationMedium to filter animated images

Source/core/rendering/RenderBoxModelObject.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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 241 matching lines @@
 
     LayoutPoint adjustedPositionRelativeToOffsetParent(const LayoutPoint&) const;
 
     void calculateBackgroundImageGeometry(const FillLayer*, const LayoutRect& paintRect, BackgroundImageGeometry&, RenderObject* = 0);
     void getBorderEdgeInfo(class BorderEdge[], const RenderStyle*, bool includeLogicalLeftEdge = true, bool includeLogicalRightEdge = true) const;
     bool borderObscuresBackgroundEdge(const FloatSize& contextScale) const;
     bool borderObscuresBackground() const;
     RoundedRect backgroundRoundedRectAdjustedForBleedAvoidance(GraphicsContext*, const LayoutRect&, BackgroundBleedAvoidance, InlineFlowBox*, const LayoutSize&, bool includeLogicalLeftEdge, bool includeLogicalRightEdge) const;
     LayoutRect borderInnerRectAdjustedForBleedAvoidance(GraphicsContext*, const LayoutRect&, BackgroundBleedAvoidance) const;
 
-    bool shouldPaintAtLowQuality(GraphicsContext*, Image*, const void*, const LayoutSize&);
+    InterpolationQuality chooseInterpolationQuality(GraphicsContext*, Image*, const void*, const LayoutSize&);
 
     RenderBoxModelObject* continuation() const;
     void setContinuation(RenderBoxModelObject*);
 
     LayoutRect localCaretRectForEmptyElement(LayoutUnit width, LayoutUnit textIndentOffset);
 
     static void clipRoundedInnerRect(GraphicsContext*, const LayoutRect&, const RoundedRect& clipRect);
 
     bool hasAutoHeightOrContainingBlockWithAutoHeight() const;
 
@@ skipping 58 matching lines @@
     void drawBoxSideFromPath(GraphicsContext*, const LayoutRect&, const Path&, const class BorderEdge[],
                             float thickness, float drawThickness, BoxSide, const RenderStyle*,
                             Color, EBorderStyle, BackgroundBleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge);
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBoxModelObject, isBoxModelObject());
 
 } // namespace WebCore
 
 #endif // RenderBoxModelObject_h