IDBObserver: Lifetime Management: Adding Observer

content/browser/indexed_db/indexed_db_transaction.cc

 // 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.
 
 #include "content/browser/indexed_db/indexed_db_transaction.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 406 matching lines @@
       base::ASCIIToUTF16("Transaction timed out due to inactivity.")));
 }
 
 void IndexedDBTransaction::CloseOpenCursors() {
   IDB_TRACE1("IndexedDBTransaction::CloseOpenCursors", "txn.id", id());
   for (auto* cursor : open_cursors_)
     cursor->Close();
   open_cursors_.clear();
 }
 
-void IndexedDBTransaction::AddPendingObserver(
-    std::unique_ptr<IndexedDBObserver> observer) {
-  pending_observers_.push_back(std::move(observer));
+void IndexedDBTransaction::AddPendingObserver(int64_t observer_id,
+                                              IndexedDBObserver* observer) {
+  pending_observers_[observer_id] = observer;
 }
 
 void IndexedDBTransaction::ActivatePendingObserver() {
-  for (size_t i = 0; i < pending_observers_.size(); i++) {
-    database_->active_observers_.push_back(std::move(pending_observers_[i]));
-  }
+  database_->active_observers_.insert(pending_observers_.begin(),
+                                      pending_observers_.end());
 }
 
 }  // namespace content