Move scroll paint property nodes to be owned by the transform tree

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

Index: third_party/WebKit/Source/platform/testing/TestPaintArtifact.h
diff --git a/third_party/WebKit/Source/platform/testing/TestPaintArtifact.h b/third_party/WebKit/Source/platform/testing/TestPaintArtifact.h
index 6c26971a0e281346610e6cbfbd6dbc1dd2fbbe7c..53e78c295c6afb428ec9fa4048b950636e17a254 100644
--- a/third_party/WebKit/Source/platform/testing/TestPaintArtifact.h
+++ b/third_party/WebKit/Source/platform/testing/TestPaintArtifact.h
@@ -47,11 +47,9 @@ class TestPaintArtifact {
   ~TestPaintArtifact();
 
   // Add to the artifact.
-  TestPaintArtifact& chunk(
-      PassRefPtr<TransformPaintPropertyNode>,
-      PassRefPtr<ClipPaintPropertyNode>,
-      PassRefPtr<EffectPaintPropertyNode>,
-      PassRefPtr<ScrollPaintPropertyNode> = ScrollPaintPropertyNode::root());
+  TestPaintArtifact& chunk(PassRefPtr<const TransformPaintPropertyNode>,
+                           PassRefPtr<const ClipPaintPropertyNode>,
+                           PassRefPtr<const EffectPaintPropertyNode>);
   TestPaintArtifact& chunk(const PaintChunkProperties&);
   TestPaintArtifact& rectDrawing(const FloatRect& bounds, Color);
   TestPaintArtifact& foreignLayer(const FloatPoint&,