[SPv2] Add CSS mix-blend-mode support

third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) Research In Motion Limited 2011. 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
@@ skipping 287 matching lines @@
     DescendantIsolationState state) {
   switch (state) {
     case DescendantIsolationRequired:
       m_hasNonIsolatedBlendingDescendants = true;
       m_hasNonIsolatedBlendingDescendantsDirty = false;
       break;
     case DescendantIsolationNeedsUpdate:
       m_hasNonIsolatedBlendingDescendantsDirty = true;
       break;
   }
+  if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled())
+    setNeedsPaintPropertyUpdate();
 }
 
 void LayoutSVGRoot::insertedIntoTree() {
   LayoutReplaced::insertedIntoTree();
   SVGResourcesCache::clientWasAddedToTree(this, styleRef());
 }
 
 void LayoutSVGRoot::willBeRemovedFromTree() {
   SVGResourcesCache::clientWillBeRemovedFromTree(this);
   LayoutReplaced::willBeRemovedFromTree();
@@ skipping 163 matching lines @@
       if (result.addNodeToListBasedTestResult(node(), locationInContainer,
                                               boundsRect) == StopHitTesting)
         return true;
     }
   }
 
   return false;
 }
 
 }  // namespace blink