FontCachePurgePreventer is needed when computing MinPreferredWidth

third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc

 // Copyright 2016 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/layout/ng/layout_ng_block_flow.h"
 
 #include "core/layout/LayoutAnalyzer.h"
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_fragment.h"
+#include "core/layout/ng/ng_min_max_content_size.h"
 
 namespace blink {
 
 LayoutNGBlockFlow::LayoutNGBlockFlow(Element* element)
     : LayoutBlockFlow(element) {}
 
 bool LayoutNGBlockFlow::isOfType(LayoutObjectType type) const {
   return type == LayoutObjectNGBlockFlow || LayoutBlockFlow::isOfType(type);
 }
 
@@ skipping 23 matching lines @@
     setLogicalLeft(computedValues.m_position);
     computeLogicalHeight(logicalHeight(), logicalTop(), computedValues);
     setLogicalTop(computedValues.m_position);
   }
 
   for (auto& descendant : result->OutOfFlowDescendants())
     descendant->UseOldOutOfFlowPositioning();
   clearNeedsLayout();
 }
 
+void LayoutNGBlockFlow::computeIntrinsicLogicalWidths(
+    LayoutUnit& minLogicalWidth,
+    LayoutUnit& maxLogicalWidth) const {
+  // TODO(layout-dev): This should be created in the constructor once instead.
+  // See also the comment in layoutBlock().
+  NGBlockNode* node = new NGBlockNode(const_cast<LayoutNGBlockFlow*>(this));
+  if (!node->CanUseNewLayout()) {
+    LayoutBlockFlow::computeIntrinsicLogicalWidths(minLogicalWidth,
+                                                   maxLogicalWidth);
+    return;
+  }
+  MinMaxContentSize sizes = node->ComputeMinMaxContentSize();
+  minLogicalWidth = sizes.min_content;
+  maxLogicalWidth = sizes.max_content;
+}
+
 }  // namespace blink