IDBObserver: Lifetime Management: Adding Observer

content/browser/indexed_db/indexed_db_transaction.h

Index: content/browser/indexed_db/indexed_db_transaction.h
diff --git a/content/browser/indexed_db/indexed_db_transaction.h b/content/browser/indexed_db/indexed_db_transaction.h
index ae1863b151f161ab6fc82e3ca1b575171d784568..59ce5f8c540d661a175616fad1eed20c11d2b639 100644
--- a/content/browser/indexed_db/indexed_db_transaction.h
+++ b/content/browser/indexed_db/indexed_db_transaction.h
@@ -27,6 +27,7 @@ namespace content {
 class BlobWriteCallbackImpl;
 class IndexedDBCursor;
 class IndexedDBDatabaseCallbacks;
+class IndexedDBObserver;
 
 class CONTENT_EXPORT IndexedDBTransaction
     : public NON_EXPORTED_BASE(base::RefCounted<IndexedDBTransaction>) {
@@ -63,6 +64,8 @@ class CONTENT_EXPORT IndexedDBTransaction
     pending_preemptive_events_--;
     DCHECK_GE(pending_preemptive_events_, 0);
   }
+  void AddPendingObserver(int64_t observer_id, IndexedDBObserver* observer);
+
   IndexedDBBackingStore::Transaction* BackingStoreTransaction() {
     return transaction_.get();
   }
@@ -123,6 +126,8 @@ class CONTENT_EXPORT IndexedDBTransaction
   leveldb::Status CommitPhaseTwo();
   void Timeout();
 
+  void ActivatePendingObserver();
+
   const int64_t id_;
   const std::set<int64_t> object_store_ids_;
   const blink::WebIDBTransactionMode mode_;
@@ -174,6 +179,7 @@ class CONTENT_EXPORT IndexedDBTransaction
   int pending_preemptive_events_;
 
   std::set<IndexedDBCursor*> open_cursors_;
+  std::map<int64_t, IndexedDBObserver*> pending_observers_;
 
   // This timer is started after requests have been processed. If no subsequent
   // requests are processed before the timer fires, assume the script is