[DMC #5.55] Add DocumentMarkerList::MarkerType()

third_party/WebKit/Source/core/editing/markers/CompositionMarkerListImpl.h

 // 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 CompositionMarkerListImpl_h
 #define CompositionMarkerListImpl_h
 
 #include "core/editing/markers/DocumentMarkerList.h"
 
 namespace blink {
 
 // Implementation of DocumentMarkerList for Composition markers.
 // Composition markers are always inserted in order, aside from some potential
 // oddball cases (e.g. splitting the marker list into two nodes, then undoing
 // the split). This means we can keep the list in sorted order to do some
 // operations more efficiently, while still being able to do inserts in O(1)
 // time at the end of the list.
 class CORE_EXPORT CompositionMarkerListImpl final : public DocumentMarkerList {
  public:
   CompositionMarkerListImpl() = default;
 
   // DocumentMarkerList implementations
+  DocumentMarker::MarkerType MarkerType() const;

[yosin_UTC9, 2017/05/12 05:00:03]

nit: s/const/const final/

+
   bool IsEmpty() const final;
 
   void Add(DocumentMarker*) final;
   void Clear() final;
 
   const HeapVector<Member<RenderedDocumentMarker>>& GetMarkers() const final;
 
   bool MoveMarkers(int length, DocumentMarkerList* dst_list) final;
   bool RemoveMarkers(unsigned start_offset, int length) final;
   bool RemoveMarkersUnderWords(const String& node_text,
                                const Vector<String>& words) final;
   bool ShiftMarkers(unsigned offset,
                     unsigned old_length,
                     unsigned new_length) final;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   HeapVector<Member<RenderedDocumentMarker>> markers_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositionMarkerListImpl);
 };
 
 }  // namespace blink
 
 #endif  // CompositionMarkerListImpl_h