Switch arguments to const Length references for performance

Source/core/rendering/style/FillLayer.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 22 matching lines @@
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 struct FillSize {
     FillSize()
         : type(SizeLength)
     {
     }
 
-    FillSize(EFillSizeType t, LengthSize l)
+    FillSize(EFillSizeType t, const LengthSize& l)
         : type(t)
         , size(l)
     {
     }
 
     bool operator==(const FillSize& o) const
     {
         return type == o.type && size == o.size;
     }
     bool operator!=(const FillSize& o) const
@@ skipping 40 matching lines @@
     bool isClipSet() const { return m_clipSet; }
     bool isOriginSet() const { return m_originSet; }
     bool isRepeatXSet() const { return m_repeatXSet; }
     bool isRepeatYSet() const { return m_repeatYSet; }
     bool isCompositeSet() const { return m_compositeSet; }
     bool isBlendModeSet() const { return m_blendModeSet; }
     bool isSizeSet() const { return m_sizeType != SizeNone; }
     bool isMaskSourceTypeSet() const { return m_maskSourceTypeSet; }
 
     void setImage(PassRefPtr<StyleImage> i) { m_image = i; m_imageSet = true; }
-    void setXPosition(Length position) { m_xPosition = position; m_xPosSet = true; m_backgroundXOriginSet = false; m_backgroundXOrigin = LeftEdge; }
-    void setYPosition(Length position) { m_yPosition = position; m_yPosSet = true; m_backgroundYOriginSet = false; m_backgroundYOrigin = TopEdge; }
+    void setXPosition(const Length& position) { m_xPosition = position; m_xPosSet = true; m_backgroundXOriginSet = false; m_backgroundXOrigin = LeftEdge; }
+    void setYPosition(const Length& position) { m_yPosition = position; m_yPosSet = true; m_backgroundYOriginSet = false; m_backgroundYOrigin = TopEdge; }
     void setBackgroundXOrigin(BackgroundEdgeOrigin origin) { m_backgroundXOrigin = origin; m_backgroundXOriginSet = true; }
     void setBackgroundYOrigin(BackgroundEdgeOrigin origin) { m_backgroundYOrigin = origin; m_backgroundYOriginSet = true; }
     void setAttachment(EFillAttachment attachment) { m_attachment = attachment; m_attachmentSet = true; }
     void setClip(EFillBox b) { m_clip = b; m_clipSet = true; }
     void setOrigin(EFillBox b) { m_origin = b; m_originSet = true; }
     void setRepeatX(EFillRepeat r) { m_repeatX = r; m_repeatXSet = true; }
     void setRepeatY(EFillRepeat r) { m_repeatY = r; m_repeatYSet = true; }
     void setComposite(CompositeOperator c) { m_composite = c; m_compositeSet = true; }
     void setBlendMode(blink::WebBlendMode b) { m_blendMode = b; m_blendModeSet = true; }
     void setSizeType(EFillSizeType b) { m_sizeType = b; }
-    void setSizeLength(LengthSize l) { m_sizeLength = l; }
+    void setSizeLength(const LengthSize& l) { m_sizeLength = l; }
     void setSize(FillSize f) { m_sizeType = f.type; m_sizeLength = f.size; }
     void setMaskSourceType(EMaskSourceType m) { m_maskSourceType = m; m_maskSourceTypeSet = true; }
 
     void clearImage() { m_image.clear(); m_imageSet = false; }
     void clearXPosition()
     {
         m_xPosSet = false;
         m_backgroundXOriginSet = false;
     }
     void clearYPosition()
@@ skipping 110 matching lines @@
     unsigned m_maskSourceTypeSet : 1;
 
     unsigned m_type : 1; // EFillLayerType
 
     mutable unsigned m_clipMax : 2; // EFillBox, maximum m_clip value from this to bottom layer
 };
 
 } // namespace WebCore
 
 #endif // FillLayer_h