WIP: Construct SPV2's scroll paint property tree

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

 // Copyright 2014 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/FramePainter.h"
 
 #include "core/editing/markers/DocumentMarkerController.h"
 #include "core/fetch/MemoryCache.h"
 #include "core/frame/FrameView.h"
 #include "core/inspector/InspectorInstrumentation.h"
@@ skipping 30 matching lines @@
         return;
 
     if (shouldPaintContents) {
         // TODO(pdr): Creating frame paint properties here will not be needed once
         // settings()->rootLayerScrolls() is enabled.
         // TODO(pdr): Make this conditional on the rootLayerScrolls setting.
         Optional<ScopedPaintChunkProperties> scopedPaintChunkProperties;
         if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
             TransformPaintPropertyNode* transform = m_frameView->scrollTranslation() ? m_frameView->scrollTranslation() : m_frameView->preTranslation();
             ClipPaintPropertyNode* clip = m_frameView->contentClip();
-            if (transform || clip) {
+            ScrollPaintPropertyNode* scroll = m_frameView->scroll();
+            if (transform || clip || scroll) {
                 PaintChunkProperties properties(context.getPaintController().currentPaintChunkProperties());
                 if (transform)
                     properties.transform = transform;
+                if (scroll)
+                    properties.scroll = scroll;
                 if (clip)
                     properties.clip = clip;
                 scopedPaintChunkProperties.emplace(context.getPaintController(), *frameView().layoutView(), properties);
             }
         }
 
         TransformRecorder transformRecorder(context, *frameView().layoutView(),
             AffineTransform::translation(frameView().x() - frameView().scrollX(), frameView().y() - frameView().scrollY()));
 
         ClipRecorder recorder(context, *frameView().layoutView(), DisplayItem::kClipFrameToVisibleContentRect, frameView().visibleContentRect());
@@ skipping 132 matching lines @@
     bar.paint(context, CullRect(rect));
 }
 
 const FrameView& FramePainter::frameView()
 {
     ASSERT(m_frameView);
     return *m_frameView;
 }
 
 } // namespace blink