Implement onunhandledrejection / onrejectionhandled events

Source/core/events/PromiseRejectionEvent.h

+// Copyright 2015 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 PromiseRejectionEvent_h
+#define PromiseRejectionEvent_h
+
+#include "bindings/core/v8/ScriptPromise.h"
+#include "bindings/core/v8/ScriptValue.h"
+#include "core/CoreExport.h"
+#include "core/events/Event.h"
+#include "core/events/PromiseRejectionEventInit.h"
+
+namespace blink {
+
+class CORE_EXPORT PromiseRejectionEvent : public Event {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static PassRefPtrWillBeRawPtr<PromiseRejectionEvent> create()
+    {
+        return adoptRefWillBeNoop(new PromiseRejectionEvent);
+    }
+    static PassRefPtrWillBeRawPtr<PromiseRejectionEvent> create(const AtomicString& type, const PromiseRejectionEventInit& initializer)
+    {
+        return adoptRefWillBeNoop(new PromiseRejectionEvent(type, initializer));
+    }
+
+    ScriptValue reason() const { return m_reason; }
+    ScriptPromise promise() const { return m_promise; }
+
+    virtual const AtomicString& interfaceName() const override;
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+    PromiseRejectionEvent();
+    PromiseRejectionEvent(const AtomicString& type, ScriptPromise, ScriptValue reason);
+    PromiseRejectionEvent(const AtomicString&, const PromiseRejectionEventInit&);
+    ~PromiseRejectionEvent() override;
+
+    ScriptPromise m_promise;
+    ScriptValue m_reason;
+};
+
+} // namespace blink
+
+#endif // PromiseRejectionEvent_h