[LayoutNG] Handle empty inlines and border edges

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

 // 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.
 
 #ifndef NGPhysicalFragment_h
 #define NGPhysicalFragment_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/geometry/ng_border_edges.h"
 #include "core/layout/ng/geometry/ng_box_strut.h"
@@ skipping 36 matching lines @@
   bool IsText() const { return Type() == NGFragmentType::kFragmentText; }
   bool IsLineBox() const { return Type() == NGFragmentType::kFragmentLineBox; }
 
   // The accessors in this class shouldn't be used by layout code directly,
   // instead should be accessed by the NGFragmentBase classes. These accessors
   // exist for paint, hit-testing, etc.
 
   // Returns the border-box size.
   NGPhysicalSize Size() const { return size_; }
 
-  // Bitmask for border edges, see NGPaintBorderEdge.
-  NGBorderEdges::Physical BorderEdges() const {
-    return static_cast<NGBorderEdges::Physical>(border_edge_);
-  }
+  // Bitmask for border edges, see NGBorderEdges::Physical.
+  unsigned BorderEdges() const { return border_edge_; }
   NGPixelSnappedPhysicalBoxStrut BorderWidths() const;
 
   // Returns the offset relative to the parent fragment's content-box.
   NGPhysicalOffset Offset() const {
     DCHECK(is_placed_);
     return offset_;
   }
 
   NGBreakToken* BreakToken() const { return break_token_.Get(); }
   const ComputedStyle& Style() const;
@@ skipping 26 matching lines @@
                      NGFragmentType type,
                      RefPtr<NGBreakToken> break_token = nullptr);
 
   LayoutObject* layout_object_;
   NGPhysicalSize size_;
   NGPhysicalOffset offset_;
   RefPtr<NGBreakToken> break_token_;
 
   unsigned type_ : 2;  // NGFragmentType
   unsigned is_placed_ : 1;
-  unsigned border_edge_ : 4;  // NGPhysicalBorderEdges
+  unsigned border_edge_ : 4;  // NGBorderEdges::Physical
 
  private:
   void Destroy() const;
 };
 
 }  // namespace blink
 
 #endif  // NGPhysicalFragment_h