Use LayoutNGBlockFlow for the block layout if layoutNG is enabled.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 48 matching lines @@
 #include "core/layout/LayoutListItem.h"
 #include "core/layout/LayoutMultiColumnSpannerPlaceholder.h"
 #include "core/layout/LayoutPart.h"
 #include "core/layout/LayoutScrollbarPart.h"
 #include "core/layout/LayoutTableCaption.h"
 #include "core/layout/LayoutTableCell.h"
 #include "core/layout/LayoutTableCol.h"
 #include "core/layout/LayoutTableRow.h"
 #include "core/layout/LayoutTheme.h"
 #include "core/layout/LayoutView.h"
+#include "core/layout/ng/LayoutNGBlockFlow.h"
 #include "core/page/AutoscrollController.h"
 #include "core/page/Page.h"
 #include "core/paint/ObjectPaintProperties.h"
 #include "core/paint/PaintLayer.h"
 #include "core/style/ContentData.h"
 #include "core/style/CursorData.h"
 #include "platform/HostWindow.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/TracedValue.h"
 #include "platform/geometry/TransformState.h"
@@ skipping 101 matching lines @@
         return image;
     }
 
     switch (style.display()) {
     case NONE:
         return nullptr;
     case INLINE:
         return new LayoutInline(element);
     case BLOCK:
     case INLINE_BLOCK:
+        if (RuntimeEnabledFeatures::layoutNGEnabled())
+            return new LayoutNGBlockFlow(element);
         return new LayoutBlockFlow(element);
     case LIST_ITEM:
         return new LayoutListItem(element);
     case TABLE:
     case INLINE_TABLE:
         return new LayoutTable(element);
     case TABLE_ROW_GROUP:
     case TABLE_HEADER_GROUP:
     case TABLE_FOOTER_GROUP:
         return new LayoutTableSection(element);
@@ skipping 3450 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
     }
 }
 
 #endif