[DMC #24] Add SpellingMarker and GrammarMarker (subclasses of DocumentMarker)

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

Index: third_party/WebKit/Source/core/editing/markers/GrammarMarker.cpp
diff --git a/third_party/WebKit/Source/core/editing/markers/GrammarMarker.cpp b/third_party/WebKit/Source/core/editing/markers/GrammarMarker.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a2b8d5c9416fc3b652ec791a130919f8768f9130
--- /dev/null
+++ b/third_party/WebKit/Source/core/editing/markers/GrammarMarker.cpp
@@ -0,0 +1,17 @@
+// 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/GrammarMarker.h"
+
+namespace blink {
+
+GrammarMarker::GrammarMarker(unsigned start_offset,
+                             unsigned end_offset,
+                             const String& description)
+    : SpellCheckMarker(DocumentMarker::kGrammar,
+                       start_offset,
+                       end_offset,
+                       description) {}

[yosin_UTC9, 2017/05/29 05:13:48]

Let's add DCHECK_LT(start_offset, end_offset)

+
+}  // namespace blink