[DMC #5.6] Add type cast for SpellCheckMarkerListImpl

third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.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 SpellCheckMarkerListImpl_h
 #define SpellCheckMarkerListImpl_h
 
 #include "core/editing/markers/DocumentMarkerList.h"
 
 namespace blink {
 
-// Implementation of DocumentMarkerList for Spelling/Grammar markers.
-// Markers with touching endpoints are merged on insert. Markers are kept sorted
-// by start offset in order to be able to do this efficiently.
+// Nearly-complete implementation of DocumentMarkerList for Spelling or Grammar
+// markers (subclassed by SpellingMarkerListImpl and GrammarMarkerListImpl to
+// implement the MarkerType() method). Markers with touching endpoints are
+// merged on insert. Markers are kept sorted by start offset in order to be able
+// to do this efficiently.
 class CORE_EXPORT SpellCheckMarkerListImpl : public DocumentMarkerList {
  public:
-  SpellCheckMarkerListImpl() = default;
-
   // DocumentMarkerList implementations
   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);
   bool ShiftMarkers(unsigned offset,
                     unsigned old_length,
                     unsigned new_length) final;
 
   DECLARE_VIRTUAL_TRACE();
 
+ protected:
+  SpellCheckMarkerListImpl() = default;
+
  private:
   HeapVector<Member<RenderedDocumentMarker>> markers_;
 
   DISALLOW_COPY_AND_ASSIGN(SpellCheckMarkerListImpl);
 };
 
+DEFINE_TYPE_CASTS(SpellCheckMarkerListImpl,
+                  DocumentMarkerList,
+                  list,
+                  true,

[yosin_UTC9, 2017/05/15 02:17:28]

MarkerType() == kSpellingMarker and MarkerType() == kGrammarMarker?

[rlanday, 2017/05/15 02:27:11]

Oh wow, I think I was missing the forest for the trees a bit here :)

+                  true);
+
 }  // namespace blink
 
 #endif  // SpellCheckMarkerListImpl_h