[LayoutNG] Change anonymous LayoutBlockFlow to LayoutNGBlockFlow

third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp b/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
index f7dff3ea1d8852f8a7c57f1fb1e7ba5fb0df5d2b..64149158469294ee7699e474f9ec9c8d777abed4 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
@@ -49,6 +49,7 @@
 #include "core/layout/line/InlineIterator.h"
 #include "core/layout/line/InlineTextBox.h"
 #include "core/layout/line/LineWidth.h"
+#include "core/layout/ng/layout_ng_block_flow.h"
 #include "core/layout/shapes/ShapeOutsideInfo.h"
 #include "core/paint/BlockFlowPaintInvalidator.h"
 #include "core/paint/PaintLayer.h"
@@ -256,7 +257,9 @@ LayoutBlockFlow::LayoutBlockFlow(ContainerNode* node) : LayoutBlock(node) {
 LayoutBlockFlow::~LayoutBlockFlow() {}
 
 LayoutBlockFlow* LayoutBlockFlow::CreateAnonymous(Document* document) {
-  LayoutBlockFlow* layout_block_flow = new LayoutBlockFlow(nullptr);
+  LayoutBlockFlow* layout_block_flow = RuntimeEnabledFeatures::layoutNGEnabled()
+                                           ? new LayoutNGBlockFlow(nullptr)
+                                           : new LayoutBlockFlow(nullptr);
   layout_block_flow->SetDocumentForAnonymous(document);
   return layout_block_flow;
 }