[IndexedDB] Adding transaction and value support to observers

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 124 matching lines @@
   void TransactionCreated(IndexedDBTransaction* transaction);
   void TransactionFinished(IndexedDBTransaction* transaction, bool committed);
 
   void AddPendingObserver(IndexedDBTransaction* transaction,
                           int32_t observer_id,
                           const IndexedDBObserver::Options& options);
 
   void FilterObservation(IndexedDBTransaction*,
                          int64_t object_store_id,
                          blink::WebIDBOperationType type,
-                         const IndexedDBKeyRange& key_range);
+                         const IndexedDBKeyRange& key_range,
+                         IndexedDBValue* value);

[cmumford, 2017/01/09 21:31:25]

Value isn't modified, so make it const. Also, add a comment above to explain
that a null value is allowed.

[dmurph, 2017/01/10 00:17:39]

Done.

   void SendObservations(
       std::map<int32_t, ::indexed_db::mojom::ObserverChangesPtr> change_map);
 
   void Get(IndexedDBTransaction* transaction,
            int64_t object_store_id,
            int64_t index_id,
            std::unique_ptr<IndexedDBKeyRange> key_range,
            bool key_only,
            scoped_refptr<IndexedDBCallbacks> callbacks);
   void GetAll(IndexedDBTransaction* transaction,
@@ skipping 186 matching lines @@
   // is executing. It prevents rentrant calls if the active request completes
   // synchronously.
   bool processing_pending_requests_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBDatabase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_H_