Implement 'will-change' parsing

Source/core/rendering/style/RenderStyle.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, 2009, 2010, 2011 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 35 matching lines @@
 #include "core/rendering/style/StyleGridData.h"
 #include "core/rendering/style/StyleGridItemData.h"
 #include "core/rendering/style/StyleMarqueeData.h"
 #include "core/rendering/style/StyleMultiColData.h"
 #include "core/rendering/style/StyleRareInheritedData.h"
 #include "core/rendering/style/StyleRareNonInheritedData.h"
 #include "core/rendering/style/StyleReflection.h"
 #include "core/rendering/style/StyleSurroundData.h"
 #include "core/rendering/style/StyleTransformData.h"
 #include "core/rendering/style/StyleVisualData.h"
+#include "core/rendering/style/StyleWillChangeData.h"
 #include "core/svg/SVGPaint.h"
 #include "platform/Length.h"
 #include "platform/LengthBox.h"
 #include "platform/LengthSize.h"
 #include "platform/ThemeTypes.h"
 #include "platform/fonts/FontBaseline.h"
 #include "platform/fonts/FontDescription.h"
 #include "platform/geometry/LayoutBoxExtent.h"
 #include "platform/geometry/RoundedRect.h"
 #include "platform/graphics/Color.h"
@@ skipping 880 matching lines @@
     void setIsolation(EIsolation v);
     bool hasIsolation() const;
 
     bool shouldPlaceBlockDirectionScrollbarOnLogicalLeft() const { return !isLeftToRightDirection() && isHorizontalWritingMode(); }
 
     TouchAction touchAction() const { return static_cast<TouchAction>(rareNonInheritedData->m_touchAction); }
     TouchActionDelay touchActionDelay() const { return static_cast<TouchActionDelay>(rareInheritedData->m_touchActionDelay); }
 
     ScrollBehavior scrollBehavior() const { return static_cast<ScrollBehavior>(rareNonInheritedData->m_scrollBehavior); }
 
+    const Vector<CSSPropertyID>& willChangeProperties() const { return rareNonInheritedData->m_willChange->m_properties; }
+    bool willChangeContents() const { return rareNonInheritedData->m_willChange->m_contents; }
+    bool willChangeScrollPosition() const { return rareNonInheritedData->m_willChange->m_scrollPosition; }
+
 // attribute setter methods
 
     void setDisplay(EDisplay v) { noninherited_flags._effectiveDisplay = v; }
     void setOriginalDisplay(EDisplay v) { noninherited_flags._originalDisplay = v; }
     void setPosition(EPosition v) { noninherited_flags._position = v; }
     void setFloating(EFloat v) { noninherited_flags._floating = v; }
 
     void setLeft(Length v) { SET_VAR(surround, offset.m_left, v); }
     void setRight(Length v) { SET_VAR(surround, offset.m_right, v); }
     void setTop(Length v) { SET_VAR(surround, offset.m_top, v); }
@@ skipping 402 matching lines @@
 
     void setLineBoxContain(LineBoxContain c) { SET_VAR(rareInheritedData, m_lineBoxContain, c); }
     void setLineClamp(LineClampValue c) { SET_VAR(rareNonInheritedData, lineClamp, c); }
     void setTapHighlightColor(const Color& c) { SET_VAR(rareInheritedData, tapHighlightColor, c); }
     void setTextSecurity(ETextSecurity aTextSecurity) { SET_VAR(rareInheritedData, textSecurity, aTextSecurity); }
     void setTouchAction(TouchAction t) { SET_VAR(rareNonInheritedData, m_touchAction, t); }
     void setTouchActionDelay(TouchActionDelay t) { SET_VAR(rareInheritedData, m_touchActionDelay, t); }
 
     void setScrollBehavior(ScrollBehavior b) { SET_VAR(rareNonInheritedData, m_scrollBehavior, b); }
 
+    void setWillChangeProperties(const Vector<CSSPropertyID>& properties) { SET_VAR(rareNonInheritedData.access()->m_willChange, m_properties, properties); }

[eseidel, 2014/02/18 23:33:52]

We'll end up copying the vector here.  That's not necessarily bad, but if
rareNonInheritedData isn't sufficiently rare, this could show up on profiles.

+    void setWillChangeContents(bool b) { SET_VAR(rareNonInheritedData.access()->m_willChange, m_contents, b); }
+    void setWillChangeScrollPosition(bool b) { SET_VAR(rareNonInheritedData.access()->m_willChange, m_scrollPosition, b); }
+
     const SVGRenderStyle* svgStyle() const { return m_svgStyle.get(); }
     SVGRenderStyle* accessSVGStyle() { return m_svgStyle.access(); }
 
     const SVGPaint::SVGPaintType& fillPaintType() const { return svgStyle()->fillPaintType(); }
     Color fillPaintColor() const { return svgStyle()->fillPaintColor(); }
     void setFillPaintColor(const Color& c) { accessSVGStyle()->setFillPaint(SVGPaint::SVG_PAINTTYPE_RGBCOLOR, c, ""); }
     float fillOpacity() const { return svgStyle()->fillOpacity(); }
     void setFillOpacity(float f) { accessSVGStyle()->setFillOpacity(f); }
 
     const SVGPaint::SVGPaintType& strokePaintType() const { return svgStyle()->strokePaintType(); }
@@ skipping 481 matching lines @@
 }
 
 inline bool RenderStyle::hasPseudoElementStyle() const
 {
     return noninherited_flags._pseudoBits & PSEUDO_ELEMENT_MASK;
 }
 
 } // namespace WebCore
 
 #endif // RenderStyle_h