[SPv2] Stop recording paired display items (except for subsequence markers)

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

Index: third_party/WebKit/Source/core/paint/ScrollRecorder.cpp
diff --git a/third_party/WebKit/Source/core/paint/ScrollRecorder.cpp b/third_party/WebKit/Source/core/paint/ScrollRecorder.cpp
index 5d788de3eb3a19f4f97b34374cee44859d296d34..fc34ced0c2f38b1aa83929a0ad3524e4aebd950a 100644
--- a/third_party/WebKit/Source/core/paint/ScrollRecorder.cpp
+++ b/third_party/WebKit/Source/core/paint/ScrollRecorder.cpp
@@ -15,6 +15,8 @@ ScrollRecorder::ScrollRecorder(GraphicsContext& context,
                                DisplayItem::Type type,
                                const IntSize& currentOffset)
     : m_client(client), m_beginItemType(type), m_context(context) {
+  if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
+    return;
   m_context.getPaintController().createAndAppend<BeginScrollDisplayItem>(
       m_client, m_beginItemType, currentOffset);
 }
@@ -29,6 +31,8 @@ ScrollRecorder::ScrollRecorder(GraphicsContext& context,
                      currentOffset) {}
 
 ScrollRecorder::~ScrollRecorder() {
+  if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
+    return;
   m_context.getPaintController().endItem<EndScrollDisplayItem>(
       m_client, DisplayItem::scrollTypeToEndScrollType(m_beginItemType));
 }