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

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

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 4943 matching lines @@
   return reasons;
 }
 
 String FrameView::mainThreadScrollingReasonsAsText() const {
   if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
     DCHECK(lifecycle().state() >= DocumentLifecycle::PrePaintClean);
 
     // 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());
   }
 
   DCHECK(lifecycle().state() >= DocumentLifecycle::CompositingClean);
   if (layerForScrolling() && layerForScrolling()->platformLayer()) {
     String result(
         MainThreadScrollingReason::mainThreadScrollingReasonsAsText(
             layerForScrolling()->platformLayer()->mainThreadScrollingReasons())
@@ skipping 92 matching lines @@
     std::unique_ptr<CompositorAnimationTimeline> timeline) {
   m_animationTimeline = std::move(timeline);
 }
 
 void FrameView::setAnimationHost(
     std::unique_ptr<CompositorAnimationHost> host) {
   m_animationHost = std::move(host);
 }
 
 }  // namespace blink