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

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index e50c31d5b9f0a793abda14ab052db54ce5433927..f63a3986bbc6d1f22cf48b5479364772c21971e2 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -4961,8 +4961,8 @@ String FrameView::mainThreadScrollingReasonsAsText() const {
     // Slimming paint v2 stores main thread scrolling reasons on property
     // trees instead of in |m_mainThreadScrollingReasons|.
     MainThreadScrollingReasons reasons = 0;
-    if (const auto* scrollNode = scroll())
-      reasons |= scrollNode->mainThreadScrollingReasons();
+    if (const auto* scrollTranslation = this->scrollTranslation())
+      reasons |= scrollTranslation->scrollNode()->mainThreadScrollingReasons();
     return String(
         MainThreadScrollingReason::mainThreadScrollingReasonsAsText(reasons)
             .c_str());