Add SpellCheckMarkerList in preparation for DocumentMarkerController refactor

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

Index: third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerList.h
diff --git a/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerList.h b/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerList.h
new file mode 100644
index 0000000000000000000000000000000000000000..0004ced3dc9518728ff7979a47f6efa78035963b
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+++ b/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerList.h
@@ -0,0 +1,39 @@
+// 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 SpellCheckMarkerList_h
+#define SpellCheckMarkerList_h
+
+#include "core/editing/markers/EditingMarkerList.h"
+
+namespace blink {
+
+class CORE_EXPORT SpellCheckMarkerList final : public EditingMarkerList {
+ public:
+  explicit SpellCheckMarkerList(DocumentMarker::MarkerType);
+
+  // DocumentMarkerList implementations
+  DocumentMarker::MarkerType allowedMarkerType() const final;
+  bool isSpellCheckMarkerList() const final;
+  void add(DocumentMarker*) final;
+
+  // SpellCheckMarkerList-specific
+  void removeMarkersForWords(const String& nodeText,
+                             const Vector<String>& words);
+
+ private:
+  const DocumentMarker::MarkerType m_type;
+
+  DISALLOW_COPY_AND_ASSIGN(SpellCheckMarkerList);
+};
+
+DEFINE_TYPE_CASTS(SpellCheckMarkerList,
+                  DocumentMarkerList,
+                  list,
+                  list->isSpellCheckMarkerList(),
+                  list.isSpellCheckMarkerList());
+
+}  // namespace blink
+
+#endif  // SpellCheckMarkerList_h