IDBObserver: Lifetime Management: Adding Observer

content/browser/indexed_db/indexed_db_database.h

 // Copyright (c) 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_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 33 matching lines @@
 
 class CONTENT_EXPORT IndexedDBDatabase
     : NON_EXPORTED_BASE(public base::RefCounted<IndexedDBDatabase>) {
  public:
   // An index and corresponding set of keys
   using IndexKeys = std::pair<int64_t, std::vector<IndexedDBKey>>;
 
   // Identifier is pair of (origin, database name).
   using Identifier = std::pair<url::Origin, base::string16>;
 
-  std::vector<std::unique_ptr<IndexedDBObserver>> active_observers_;
+  std::map<int64_t, IndexedDBObserver*> active_observers_;
 
   static const int64_t kInvalidId = 0;
   static const int64_t kMinimumIndexId = 30;
 
   static scoped_refptr<IndexedDBDatabase> Create(
       const base::string16& name,
       IndexedDBBackingStore* backing_store,
       IndexedDBFactory* factory,
       const Identifier& unique_identifier,
       leveldb::Status* s);
@@ skipping 56 matching lines @@
     return transaction_coordinator_;
   }
 
   void TransactionCreated(IndexedDBTransaction* transaction);
   void TransactionFinished(IndexedDBTransaction* transaction, bool committed);
 
   // Called by transactions to report failure committing to the backing store.
   void TransactionCommitFailed(const leveldb::Status& status);
 
   void Observe(int64_t transaction_id, int64_t observer_id);
+  void Unobserve(std::vector<int64_t> observersToRemove);
 
   void Get(int64_t transaction_id,
            int64_t object_store_id,
            int64_t index_id,
            std::unique_ptr<IndexedDBKeyRange> key_range,
            bool key_only,
            scoped_refptr<IndexedDBCallbacks> callbacks);
   void GetAll(int64_t transaction_id,
               int64_t object_store_id,
               int64_t index_id,
@@ skipping 176 matching lines @@
 
   ConnectionSet connections_;
   bool experimental_web_platform_features_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBDatabase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_H_