[LayoutNG] Add NGLineBoxFragment

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

-// Copyright 2016 The Chromium Authors. All rights reserved.
+// Copyright 2017 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 NGBoxFragment_h
-#define NGBoxFragment_h
+#ifndef NGLineBoxFragment_h
+#define NGLineBoxFragment_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_fragment.h"
-#include "core/layout/ng/ng_physical_box_fragment.h"
+#include "core/layout/ng/ng_physical_line_box_fragment.h"
 #include "core/layout/ng/ng_writing_mode.h"
 
 namespace blink {
 
-class CORE_EXPORT NGBoxFragment final : public NGFragment {
+class CORE_EXPORT NGLineBoxFragment final : public NGFragment {
  public:
-  NGBoxFragment(NGWritingMode writing_mode,
-                const NGPhysicalBoxFragment* physical_fragment)
+  NGLineBoxFragment(NGWritingMode writing_mode,
+                    const NGPhysicalLineBoxFragment* physical_fragment)
       : NGFragment(writing_mode, physical_fragment) {}
-
-  const WTF::Optional<NGLogicalOffset>& BfcOffset() const;
-
-  const NGMarginStrut& EndMarginStrut() const;
 };
 
-DEFINE_TYPE_CASTS(NGBoxFragment,
+DEFINE_TYPE_CASTS(NGLineBoxFragment,
                   NGFragment,
                   fragment,
-                  fragment->Type() == NGPhysicalFragment::kFragmentBox,
-                  fragment.Type() == NGPhysicalFragment::kFragmentBox);
+                  fragment->Type() == NGPhysicalFragment::kFragmentLineBox,
+                  fragment.Type() == NGPhysicalFragment::kFragmentLineBox);
 
 }  // namespace blink
 
-#endif  // NGBoxFragment_h
+#endif  // NGLineBoxFragment_h