Implement callback reactions for Custom Elements V1

third_party/WebKit/Source/core/dom/custom/CustomElementAttributeChangedCallbackReaction.h

Index: third_party/WebKit/Source/core/dom/custom/CustomElementAttributeChangedCallbackReaction.h
diff --git a/third_party/WebKit/Source/core/dom/custom/CustomElementAttributeChangedCallbackReaction.h b/third_party/WebKit/Source/core/dom/custom/CustomElementAttributeChangedCallbackReaction.h
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index 0000000000000000000000000000000000000000..a7c7a63ca2a19aa8c41e1d571b708abf2aa7a673
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+++ b/third_party/WebKit/Source/core/dom/custom/CustomElementAttributeChangedCallbackReaction.h
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+// 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.
+
+#ifndef CustomElementAttributeChangedCallbackReaction_h
+#define CustomElementAttributeChangedCallbackReaction_h
+
+#include "core/CoreExport.h"
+#include "core/dom/QualifiedName.h"
+#include "core/dom/custom/CustomElementReaction.h"
+#include "platform/heap/Handle.h"
+#include "wtf/Noncopyable.h"
+
+namespace blink {
+
+class CORE_EXPORT CustomElementAttributeChangedCallbackReaction final
+    : public CustomElementReaction {
+    WTF_MAKE_NONCOPYABLE(CustomElementAttributeChangedCallbackReaction);
+public:
+    CustomElementAttributeChangedCallbackReaction(CustomElementDefinition*,
+        const QualifiedName&,
+        const AtomicString& oldValue, const AtomicString& newValue);
+
+private:
+    void invoke(Element*) override;
+
+    QualifiedName m_name;
+    AtomicString m_oldValue;
+    AtomicString m_newValue;
+};
+
+} // namespace blink
+
+#endif // CustomElementAttributeChangedCallbackReaction_h