[SPv2] Add CSS mix-blend-mode support

third_party/WebKit/Source/platform/testing/PaintPropertyTestHelpers.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/graphics/paint/ClipPaintPropertyNode.h"
 #include "platform/graphics/paint/EffectPaintPropertyNode.h"
 #include "platform/graphics/paint/PaintChunkProperties.h"
 #include "platform/graphics/paint/ScrollPaintPropertyNode.h"
 #include "platform/graphics/paint/TransformPaintPropertyNode.h"
 
 namespace blink {
 namespace testing {
 
 static inline PassRefPtr<EffectPaintPropertyNode> createOpacityOnlyEffect(
     PassRefPtr<const EffectPaintPropertyNode> parent,
     float opacity) {
   RefPtr<TransformPaintPropertyNode> localTransformSpace =
       const_cast<TransformPaintPropertyNode*>(parent->localTransformSpace());
   RefPtr<ClipPaintPropertyNode> outputClip =
       const_cast<ClipPaintPropertyNode*>(parent->outputClip());
   return EffectPaintPropertyNode::create(
       std::move(parent), std::move(localTransformSpace), std::move(outputClip),
-      CompositorFilterOperations(), opacity);
+      CompositorFilterOperations(), opacity, SkBlendMode::kSrcOver);
 }
 
 static inline PaintChunkProperties defaultPaintChunkProperties() {
   PropertyTreeState propertyTreeState(
       TransformPaintPropertyNode::root(), ClipPaintPropertyNode::root(),
       EffectPaintPropertyNode::root(), ScrollPaintPropertyNode::root());
   PaintChunkProperties defaultProperties(propertyTreeState);
 
   return defaultProperties;
 }
 
 }  // namespace testing
 }  // namespace blink