Implement 'will-change' parsing

Source/core/css/CSSComputedStyleDeclaration.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ skipping 187 matching lines @@
     CSSPropertyTransitionDelay,
     CSSPropertyTransitionDuration,
     CSSPropertyTransitionProperty,
     CSSPropertyTransitionTimingFunction,
     CSSPropertyUnicodeBidi,
     CSSPropertyVerticalAlign,
     CSSPropertyVisibility,
     CSSPropertyWhiteSpace,
     CSSPropertyWidows,
     CSSPropertyWidth,
+    CSSPropertyWillChange,
     CSSPropertyWordBreak,
     CSSPropertyWordSpacing,
     CSSPropertyWordWrap,
     CSSPropertyZIndex,
     CSSPropertyZoom,
 
     CSSPropertyWebkitAnimationDelay,
     CSSPropertyWebkitAnimationDirection,
     CSSPropertyWebkitAnimationDuration,
     CSSPropertyWebkitAnimationFillMode,
@@ skipping 858 matching lines @@
     case CSSAnimationData::AnimationDirectionReverse:
         return cssValuePool().createIdentifierValue(CSSValueReverse);
     case CSSAnimationData::AnimationDirectionAlternateReverse:
         return cssValuePool().createIdentifierValue(CSSValueAlternateReverse);
     default:
         ASSERT_NOT_REACHED();
         return 0;
     }
 }
 
+static PassRefPtr<CSSValue> valueForWillChange(const Vector<CSSPropertyID>& willChangeProperties, bool willChangeContents, bool willChangeScrollPosition)
+{
+    RefPtrWillBeRawPtr<CSSValueList> list = CSSValueList::createCommaSeparated();
+    if (willChangeContents)
+        list->append(cssValuePool().createIdentifierValue(CSSValueContents));
+    if (willChangeScrollPosition)
+        list->append(cssValuePool().createIdentifierValue(CSSValueScrollPosition));
+    for (size_t i = 0; i < willChangeProperties.size(); ++i)
+        list->append(cssValuePool().createIdentifierValue(willChangeProperties[i]));
+    if (!list->length())
+        list->append(cssValuePool().createIdentifierValue(CSSValueAuto));
+    return list.release();
+}
+
 static PassRefPtr<CSSValue> createLineBoxContainValue(unsigned lineBoxContain)
 {
     if (!lineBoxContain)
         return cssValuePool().createIdentifierValue(CSSValueNone);
     return CSSLineBoxContainValue::create(lineBoxContain);
 }
 
 CSSComputedStyleDeclaration::CSSComputedStyleDeclaration(PassRefPtr<Node> n, bool allowVisitedStyle, const String& pseudoElementName)
     : m_node(n)
     , m_allowVisitedStyle(allowVisitedStyle)
@@ skipping 1150 matching lines @@
             return cssValuePool().createValue(style->widows(), CSSPrimitiveValue::CSS_NUMBER);
         case CSSPropertyWidth:
             if (renderer) {
                 // According to http://www.w3.org/TR/CSS2/visudet.html#the-width-property,
                 // the "width" property does not apply for non-replaced inline elements.
                 if (!renderer->isReplaced() && renderer->isInline())
                     return cssValuePool().createIdentifierValue(CSSValueAuto);
                 return zoomAdjustedPixelValue(sizingBox(renderer).width(), *style);
             }
             return zoomAdjustedPixelValueForLength(style->width(), *style);
+        case CSSPropertyWillChange:
+            return valueForWillChange(style->willChangeProperties(), style->willChangeContents(), style->willChangeScrollPosition());
         case CSSPropertyWordBreak:
             return cssValuePool().createValue(style->wordBreak());
         case CSSPropertyWordSpacing:
             return zoomAdjustedPixelValue(style->wordSpacing(), *style);
         case CSSPropertyWordWrap:
             return cssValuePool().createValue(style->overflowWrap());
         case CSSPropertyWebkitLineBreak:
             return cssValuePool().createValue(style->lineBreak());
         case CSSPropertyResize:
             return cssValuePool().createValue(style->resize());
@@ skipping 752 matching lines @@
     static const CSSPropertyID propertiesAfterSlashSeperator[3] = { CSSPropertyBackgroundSize, CSSPropertyBackgroundOrigin,
                                                                     CSSPropertyBackgroundClip };
 
     RefPtrWillBeRawPtr<CSSValueList> list = CSSValueList::createSlashSeparated();
     list->append(valuesForShorthandProperty(StylePropertyShorthand(CSSPropertyBackground, propertiesBeforeSlashSeperator, WTF_ARRAY_LENGTH(propertiesBeforeSlashSeperator))));
     list->append(valuesForShorthandProperty(StylePropertyShorthand(CSSPropertyBackground, propertiesAfterSlashSeperator, WTF_ARRAY_LENGTH(propertiesAfterSlashSeperator))));
     return list.release();
 }
 
 } // namespace WebCore