void IDBDatabaseBackend::count(int64_t transactionId, int64_t objectStoreId, int64_t indexId, PassRefPtr<IDBKeyRange> keyRange, PassRefPtr<IDBCallbacks> callbacks)
{
    LOG(StorageAPI, "IDBDatabaseBackend::count");
    IDBTransactionBackend* transaction = m_transactions.get(transactionId);
    if (!transaction)
        return;

    ASSERT(m_metadata.objectStores.contains(objectStoreId));
    transaction->scheduleCountOperation(objectStoreId, indexId, keyRange, callbacks);
}