FontCachePurgePreventer is needed when computing MinPreferredWidth

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

Index: third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.h
diff --git a/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.h b/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.h
index fad911ae7e866ba334887d665a99d674213b53a2..543b94f1fcfc5f94352dcb52112d48ff3fc3106c 100644
--- a/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.h
+++ b/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.h
@@ -19,6 +19,11 @@ class LayoutNGBlockFlow final : public LayoutBlockFlow {
   void layoutBlock(bool relayoutChildren) override;
   NGBlockNode* boxForTesting() const { return m_box.get(); }
 
+ protected:
+  void computeIntrinsicLogicalWidths(
+      LayoutUnit& minLogicalWidth,
+      LayoutUnit& maxLogicalWidth) const override;
+
  private:
   bool isOfType(LayoutObjectType) const override;