[ActiveSuggestionMarker #2] Add ActiveSuggestionMarker

third_party/WebKit/Source/core/editing/markers/ActiveSuggestionMarker.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 ActiveSuggestionMarker_h
+#define ActiveSuggestionMarker_h
+
+#include "core/editing/markers/StyleableMarker.h"
+
+namespace blink {
+
+// A subclass of DocumentMarker used to store information specific to
+// composition markers. We store what color to display the underline (possibly
+// transparent), whether the underline should be thick or not, and what
+// background color should be used under the marked text (also possibly
+// transparent).
+class CORE_EXPORT ActiveSuggestionMarker final : public StyleableMarker {
+ public:
+  ActiveSuggestionMarker(unsigned start_offset,
+                         unsigned end_offset,
+                         Color underline_color,
+                         Thickness,
+                         Color background_color);
+
+  // DocumentMarker implementations
+  MarkerType GetType() const;

[yosin_UTC9, 2017/06/06 01:27:47]

nit: s/;/const final;/

+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ActiveSuggestionMarker);
+};
+
+DEFINE_TYPE_CASTS(ActiveSuggestionMarker,
+                  DocumentMarker,
+                  marker,
+                  marker->GetType() == DocumentMarker::kActiveSuggestion,
+                  marker.GetType() == DocumentMarker::kActiveSuggestion);
+
+}  // namespace blink
+
+#endif