[Blending and compositing] Implement the isolation CSS property in software

Source/core/rendering/style/RenderStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. 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 817 matching lines @@
         return static_cast<EIsolation>(rareNonInheritedData->m_isolation);
     return IsolationAuto;
 }
 
 void RenderStyle::setIsolation(EIsolation v)
 {
     if (RuntimeEnabledFeatures::cssCompositingEnabled())
         rareNonInheritedData.access()->m_isolation = v;
 }
 
+bool RenderStyle::hasIsolation() const
+{
+    if (RuntimeEnabledFeatures::cssCompositingEnabled())
+        return rareNonInheritedData->m_isolation != IsolationAuto;
+    return false;
+}
+
 inline bool requireTransformOrigin(const Vector<RefPtr<TransformOperation> >& transformOperations, RenderStyle::ApplyTransformOrigin applyOrigin)
 {
     // transform-origin brackets the transform with translate operations.
     // Optimize for the case where the only transform is a translation, since the transform-origin is irrelevant
     // in that case.
     if (applyOrigin != RenderStyle::IncludeTransformOrigin)
         return false;
 
     unsigned size = transformOperations.size();
     for (unsigned i = 0; i < size; ++i) {
@@ skipping 753 matching lines @@
     surround.access()->border.m_image.setOutset(outset);
 }
 
 ShapeValue* RenderStyle::initialShapeInside()
 {
     DEFINE_STATIC_REF(ShapeValue, sOutsideValue, (ShapeValue::createOutsideValue()));
     return sOutsideValue;
 }
 
 } // namespace WebCore