Upgrade in-document custom elements when an element is defined.

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

Index: third_party/WebKit/Source/core/dom/custom/CustomElementUpgradeReaction.cpp
diff --git a/third_party/WebKit/Source/core/dom/custom/CustomElementUpgradeReaction.cpp b/third_party/WebKit/Source/core/dom/custom/CustomElementUpgradeReaction.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..7198c6f95c469150540a7604075ca7dec524bad1
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/custom/CustomElementUpgradeReaction.cpp
@@ -0,0 +1,31 @@
+// 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/CustomElementUpgradeReaction.h"
+
+#include "core/dom/Element.h"
+#include "core/dom/custom/CustomElementDefinition.h"
+
+namespace blink {
+
+CustomElementUpgradeReaction::CustomElementUpgradeReaction(
+    CustomElementDefinition* definition)
+    : m_definition(definition)
+{
+}
+
+CustomElementUpgradeReaction::~CustomElementUpgradeReaction() = default;
+
+DEFINE_TRACE(CustomElementUpgradeReaction)
+{
+    CustomElementReaction::trace(visitor);
+    visitor->trace(m_definition);
+}
+
+void CustomElementUpgradeReaction::invoke(Element* element)
+{
+    m_definition->upgrade(element);
+}
+
+} // namespace blink