Implement callback reactions for Custom Elements V1

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

Index: third_party/WebKit/Source/core/dom/custom/CustomElementReaction.cpp
diff --git a/third_party/WebKit/Source/core/dom/custom/CustomElementReaction.cpp b/third_party/WebKit/Source/core/dom/custom/CustomElementReaction.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..0224a6c3fd8425941ca198c7e34a560afbb61c4e
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/custom/CustomElementReaction.cpp
@@ -0,0 +1,22 @@
+// 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