Combine background repaint conditions in RenderStyle and RenderObject

Source/core/rendering/RenderObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 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
@@ skipping 507 matching lines @@
     bool hasLayer() const { return m_bitfields.hasLayer(); }
 
     enum BoxDecorationState {
         NoBoxDecorations,
         HasBoxDecorationsAndBackgroundObscurationStatusInvalid,
         HasBoxDecorationsAndBackgroundIsKnownToBeObscured,
         HasBoxDecorationsAndBackgroundMayBeVisible,
     };
     bool hasBoxDecorations() const { return m_bitfields.boxDecorationState() != NoBoxDecorations; }
     bool backgroundIsKnownToBeObscured();
-    bool borderImageIsLoadedAndCanBeRendered() const;
-    bool mustRepaintBackgroundOrBorder() const;
+    bool canRenderBorderImage() const;
+    bool mustRepaintBackgroundOrBorderOnWidthChange() const;
+    bool mustRepaintBackgroundOrBorderOnHeightChange() const;
+    bool mustRepaintFillLayersOnWidthChange(const FillLayer&) const;
+    bool mustRepaintFillLayersOnHeightChange(const FillLayer&) const;
     bool hasBackground() const { return style()->hasBackground(); }
     bool hasEntirelyFixedBackground() const;
 
     bool needsLayout() const
     {
         return m_bitfields.selfNeedsLayout() || m_bitfields.normalChildNeedsLayout() || m_bitfields.posChildNeedsLayout()
             || m_bitfields.needsSimplifiedNormalFlowLayout() || m_bitfields.needsPositionedMovementLayout();
     }
 
     bool selfNeedsLayout() const { return m_bitfields.selfNeedsLayout(); }
@@ skipping 938 matching lines @@
 void showTree(const WebCore::RenderObject*);
 void showLineTree(const WebCore::RenderObject*);
 void showRenderTree(const WebCore::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const WebCore::RenderObject* object1, const WebCore::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h