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

Source/core/rendering/RenderObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2933 matching lines @@
     }
 
     return document().styleResolver()->pseudoStyleForElement(element, pseudoStyleRequest, parentStyle);
 }
 
 bool RenderObject::hasBlendMode() const
 {
     return RuntimeEnabledFeatures::cssCompositingEnabled() && style() && style()->hasBlendMode();
 }
 
+bool RenderObject::hasIsolation() const
+{
+    return RuntimeEnabledFeatures::cssCompositingEnabled() && style() && style()->hasIsolation();
+}
+
 static Color decorationColor(const RenderObject* object, RenderStyle* style)
 {
     Color result;
     // Check for text decoration color first.
     result = object->resolveColor(style, CSSPropertyTextDecorationColor);
     if (result.isValid())
         return result;
     if (style->textStrokeWidth() > 0) {
         // Prefer stroke color if possible but not if it's fully transparent.
         result = object->resolveColor(style, CSSPropertyWebkitTextStrokeColor);
@@ skipping 403 matching lines @@
 {
     if (object1) {
         const WebCore::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif