IDBObserver: Lifetime Management: Adding Observer

content/child/indexed_db/webidbdatabase_impl.h

 // Copyright 2013 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 CONTENT_CHILD_INDEXED_DB_WEBIDBDATABASE_IMPL_H_
 #define CONTENT_CHILD_INDEXED_DB_WEBIDBDATABASE_IMPL_H_
 
 #include <stdint.h>
 
 #include "base/memory/ref_counted.h"
@@ skipping 29 matching lines @@
                          long long object_store_id) override;
   void createTransaction(long long transaction_id,
                          blink::WebIDBDatabaseCallbacks* callbacks,
                          const blink::WebVector<long long>& scope,
                          blink::WebIDBTransactionMode mode) override;
 
   void close() override;
   void versionChangeIgnored() override;
 
   void observe(blink::IDBObserver* observer, long long transactionId) override;
+  void unobserve(blink::IDBObserver* observer) override;
 
   void get(long long transactionId,
            long long objectStoreId,
            long long indexId,
            const blink::WebIDBKeyRange&,
            bool keyOnly,
            blink::WebIDBCallbacks*) override;
   void getAll(long long transactionId,
               long long objectStoreId,
               long long indexId,
@@ skipping 50 matching lines @@
                    long long indexId) override;
   void abort(long long transaction_id) override;
   void commit(long long transaction_id) override;
   void ackReceivedBlobs(
       const blink::WebVector<blink::WebString>& uuids) override;
 
  private:
   int32_t ipc_database_id_;
   int32_t ipc_database_callbacks_id_;
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
+  std::vector<int32_t> observers_id_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_INDEXED_DB_WEBIDBDATABASE_IMPL_H_