Refactor the API for setting dynamic resource load priorities

Source/core/layout/LayoutBox.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 572 matching lines @@
     LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = nullptr) override;
 
     virtual LayoutRect overflowClipRect(const LayoutPoint& location, OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize) const;
     LayoutRect clipRect(const LayoutPoint& location);
     virtual bool hasControlClip() const { return false; }
     virtual LayoutRect controlClipRect(const LayoutPoint&) const { return LayoutRect(); }
 
     virtual void paintBoxDecorationBackground(const PaintInfo&, const LayoutPoint&);
     virtual void paintMask(const PaintInfo&, const LayoutPoint&);
     void imageChanged(WrappedImagePtr, const IntRect* = nullptr) override;
+    ResourcePriority updatePriority(Resource*) final;
 
     void logicalExtentAfterUpdatingLogicalWidth(const LayoutUnit& logicalTop, LogicalExtentComputedValues&);
 
     PositionWithAffinity positionForPoint(const LayoutPoint&) override;
 
     void removeFloatingOrPositionedChildFromBlockLists();
 
     DeprecatedPaintLayer* enclosingFloatPaintingLayer() const;
 
     virtual int firstLineBoxBaseline() const { return -1; }
@@ skipping 334 matching lines @@
         if (UNLIKELY(inlineBoxWrapper() != nullptr))
             deleteLineBoxWrapper();
     }
 
     ensureRareData().m_inlineBoxWrapper = boxWrapper;
 }
 
 } // namespace blink
 
 #endif // LayoutBox_h