[LayoutNG] Add base class for NGFragment and NGText

third_party/WebKit/Source/core/layout/ng/ng_fragment_base.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 NGFragment_h
-#define NGFragment_h
+#ifndef NGFragmentBase_h
+#define NGFragmentBase_h
 
 #include "core/CoreExport.h"
 #include "platform/LayoutUnit.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
-class CORE_EXPORT NGFragment final : public GarbageCollected<NGFragment> {
+class CORE_EXPORT NGFragmentBase : public GarbageCollected<NGFragmentBase> {
  public:
-  NGFragment(LayoutUnit inlineSize,
-             LayoutUnit blockSize,
-             LayoutUnit inlineOverflow,
-             LayoutUnit blockOverflow);
-
   // Returns the border-box size.
   LayoutUnit inlineSize() const { return m_inlineSize; }
   LayoutUnit blockSize() const { return m_blockSize; }
 
   // Returns the total size, including the contents outside of the border-box.
   LayoutUnit inlineOverflow() const { return m_inlineOverflow; }
   LayoutUnit blockOverflow() const { return m_blockOverflow; }
 
   // Returns the offset relative to the parent fragement's content-box.
   LayoutUnit inlineOffset() const { return m_inlineOffset; }
   LayoutUnit blockOffset() const { return m_blockOffset; }
 
   // Should only be used by the parent fragement's layout.
   void setOffset(LayoutUnit inlineOffset, LayoutUnit blockOffset);
 
+  DEFINE_INLINE_TRACE_AFTER_DISPATCH() {}
   DECLARE_TRACE();
 
- private:
+ protected:
+  NGFragmentBase(LayoutUnit inlineSize,
+                 LayoutUnit blockSize,
+                 LayoutUnit inlineOverflow,
+                 LayoutUnit blockOverflow);
+
   LayoutUnit m_inlineSize;
   LayoutUnit m_blockSize;
-
   LayoutUnit m_inlineOverflow;
   LayoutUnit m_blockOverflow;
-
   LayoutUnit m_inlineOffset;
   LayoutUnit m_blockOffset;
-
-  HeapVector<Member<const NGFragment>> m_children;
+  bool m_isText;
 };
 
 }  // namespace blink
 
-#endif  // NGFragment_h
+#endif  // NGFragmentBase_h