IDBObserver: Lifetime Management: Adding Observer

content/browser/indexed_db/indexed_db_database.h

Index: content/browser/indexed_db/indexed_db_database.h
diff --git a/content/browser/indexed_db/indexed_db_database.h b/content/browser/indexed_db/indexed_db_database.h
index 72d65ce723e985a331cdd2c3e286af32d2ade7c3..f659161cad5ff74c849697632c611a2e45eb9302 100644
--- a/content/browser/indexed_db/indexed_db_database.h
+++ b/content/browser/indexed_db/indexed_db_database.h
@@ -38,6 +38,7 @@ class IndexedDBFactory;
 class IndexedDBKey;
 class IndexedDBKeyPath;
 class IndexedDBKeyRange;
+class IndexedDBObserver;
 class IndexedDBTransaction;
 struct IndexedDBValue;
 
@@ -50,6 +51,8 @@ class CONTENT_EXPORT IndexedDBDatabase
   // Identifier is pair of (origin, database name).
   using Identifier = std::pair<url::Origin, base::string16>;
 
+  std::vector<std::unique_ptr<IndexedDBObserver>> active_observers_;

[dmurph, 2016/06/15 12:49:43]

we'll want a map here of unique id -> observer so we can easily remove as well.

Generate the unique ID as outlined below.

[palakj1, 2016/06/16 07:05:40]

Done.

+
   static const int64_t kInvalidId = 0;
   static const int64_t kMinimumIndexId = 30;
 
@@ -124,6 +127,8 @@ class CONTENT_EXPORT IndexedDBDatabase
   // 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 Get(int64_t transaction_id,
            int64_t object_store_id,
            int64_t index_id,