[SPv2] Add CSS mix-blend-mode support

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

Index: third_party/WebKit/Source/platform/testing/PaintPropertyTestHelpers.h
diff --git a/third_party/WebKit/Source/platform/testing/PaintPropertyTestHelpers.h b/third_party/WebKit/Source/platform/testing/PaintPropertyTestHelpers.h
index fcaa385354f886e68d223171fc89c4e9bbf86a70..128cd551fe9d1467b6b8c4e1c9a6480694c5153c 100644
--- a/third_party/WebKit/Source/platform/testing/PaintPropertyTestHelpers.h
+++ b/third_party/WebKit/Source/platform/testing/PaintPropertyTestHelpers.h
@@ -20,7 +20,7 @@ static inline PassRefPtr<EffectPaintPropertyNode> createOpacityOnlyEffect(
       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() {