Move NG floats utility methods to the separate file

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_physical_offset.h"
 #include "core/layout/ng/geometry/ng_physical_size.h"
@@ skipping 73 matching lines @@
   NGBreakToken* BreakToken() const { return break_token_.get(); }
 
   const ComputedStyle& Style() const;
 
   // GetLayoutObject should only be used when necessary for compatibility
   // with LegacyLayout.
   LayoutObject* GetLayoutObject() const { return layout_object_; }
 
   bool IsPlaced() const { return is_placed_; }
 
+  String ToString() const;
+
  protected:
   NGPhysicalFragment(LayoutObject* layout_object,
                      NGPhysicalSize size,
                      NGPhysicalSize overflow,
                      NGFragmentType type,
                      RefPtr<NGBreakToken> break_token = nullptr);
 
   LayoutObject* layout_object_;
   NGPhysicalSize size_;
   NGPhysicalSize overflow_;
   NGPhysicalOffset offset_;
   RefPtr<NGBreakToken> break_token_;
 
   unsigned type_ : 1;
   unsigned is_placed_ : 1;
 
  private:
   void destroy() const;
 };
 
 }  // namespace blink
 
 #endif  // NGPhysicalFragment_h