IDBObserver: Lifetime Management: Adding Observer

third_party/WebKit/Source/modules/indexeddb/WebIDBObserverImpl.h

+// 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 WebIDBObserverImpl_h
+#define WebIDBObserverImpl_h
+
+#include "platform/heap/Persistent.h"
+#include "public/platform/modules/indexeddb/WebIDBObserver.h"
+
+namespace blink {
+
+class IDBObserver;
+
+class WebIDBObserverImpl final : public WebIDBObserver {
+    USING_FAST_MALLOC(WebIDBObserverImpl);
+
+public:
+    static std::unique_ptr<WebIDBObserverImpl> create(IDBObserver*);
+
+    ~WebIDBObserverImpl() override;
+
+    void setId(int32_t);
+
+private:
+    enum { kInvalidObserverId = -1 };
+
+    explicit WebIDBObserverImpl(IDBObserver*);
+
+    int32_t m_id;
+    Persistent<IDBObserver> m_observer;
+};
+
+} // namespace blink
+
+#endif // WebIDBObserverImpl_h