Implement callback reactions for Custom Elements V1

third_party/WebKit/Source/core/dom/custom/CustomElementReaction.cpp

+// Copyright 2016 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/dom/custom/CustomElementReaction.h"
+
+#include "core/dom/custom/CustomElementDefinition.h"
+
+namespace blink {
+
+CustomElementReaction::CustomElementReaction(
+    CustomElementDefinition* definition)
+    : m_definition(definition)
+{
+}
+
+DEFINE_TRACE(CustomElementReaction)
+{
+    visitor->trace(m_definition);
+}
+
+} // namespace blink