[SPv2] Fix logic for blending effect nodes due to non-isolated children of SVG.

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp

 // Copyright 2015 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 "core/paint/PaintPropertyTreeBuilderTest.h"
 
 #include "core/html/HTMLIFrameElement.h"
 #include "core/layout/LayoutTreeAsText.h"
 #include "core/paint/ObjectPaintProperties.h"
 #include "core/paint/PaintPropertyTreePrinter.h"
@@ skipping 3376 matching lines @@
   // The <marker> object resets to a new paint property tree, so the
   // transform within it should have the root as parent.
   EXPECT_EQ(TransformPaintPropertyNode::root(),
             transformInsideSymbolProperties->transform()->parent());
 
   // Whereas this is not true of the transform above the path.
   EXPECT_EQ(svgProperties->svgLocalToBorderBoxTransform(),
             transformOutsideUseProperties->transform()->parent());
 }
 
+TEST_P(PaintPropertyTreeBuilderTest, SVGRootBlending) {
+  setBodyInnerHTML(
+      "<svg id='svgroot' 'width=100' height='100'"
+      "    style='position: relative; z-index: 0'>"
+      " <rect width='100' height='100' fill='#00FF00'"
+      "     style='mix-blend-mode: difference'/>"
+      "</svg>");
+
+  LayoutObject& svgRoot = *document().getElementById("svgroot")->layoutObject();
+  const ObjectPaintProperties* svgRootProperties = svgRoot.paintProperties();
+  EXPECT_TRUE(svgRootProperties->effect());
+  EXPECT_EQ(EffectPaintPropertyNode::root(),
+            svgRootProperties->effect()->parent());
+}
+
 }  // namespace blink