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diff --git a/chromium/third_party/blink/renderer/core/editing/markers/composition_marker.h b/chromium/third_party/blink/renderer/core/editing/markers/composition_marker.h
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+++ b/chromium/third_party/blink/renderer/core/editing/markers/composition_marker.h
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+// 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 THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_MARKERS_COMPOSITION_MARKER_H_
+#define THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_MARKERS_COMPOSITION_MARKER_H_
+
+#include "third_party/blink/renderer/core/editing/markers/styleable_marker.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 CompositionMarker final : public StyleableMarker {
+ public:
+  CompositionMarker(unsigned start_offset,
+                    unsigned end_offset,
+                    Color underline_color,
+                    ui::mojom::ImeTextSpanThickness,
+                    Color background_color);
+
+  // DocumentMarker implementations
+  MarkerType GetType() const final;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CompositionMarker);
+};
+
+DEFINE_TYPE_CASTS(CompositionMarker,
+                  DocumentMarker,
+                  marker,
+                  marker->GetType() == DocumentMarker::kComposition,
+                  marker.GetType() == DocumentMarker::kComposition);
+
+}  // namespace blink
+
+#endif