[DMC #23] Add CompositionMarker (subclass of DocumentMarker)

third_party/WebKit/Source/core/editing/markers/CompositionMarker.cpp

Index: third_party/WebKit/Source/core/editing/markers/CompositionMarker.cpp
diff --git a/third_party/WebKit/Source/core/editing/markers/CompositionMarker.cpp b/third_party/WebKit/Source/core/editing/markers/CompositionMarker.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f445f502b496b4608790cf16e0b725f2a00e337a
--- /dev/null
+++ b/third_party/WebKit/Source/core/editing/markers/CompositionMarker.cpp
@@ -0,0 +1,31 @@
+// 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.
+
+#include "core/editing/markers/CompositionMarker.h"
+
+namespace blink {
+
+CompositionMarker::CompositionMarker(unsigned start_offset,
+                                     unsigned end_offset,
+                                     Color underline_color,
+                                     bool thick,
+                                     Color background_color)
+    : DocumentMarker(DocumentMarker::kComposition, start_offset, end_offset),
+      underline_color_(underline_color),
+      background_color_(background_color),
+      thick_(thick) {}
+
+Color CompositionMarker::UnderlineColor() const {
+  return underline_color_;
+}
+
+bool CompositionMarker::Thick() const {
+  return thick_;
+}
+
+Color CompositionMarker::BackgroundColor() const {
+  return background_color_;
+}
+
+}  // namespace blink