bluetooth: mac: add connected LE devices to chooser

device/bluetooth/bluetooth_adapter.cc

Index: device/bluetooth/bluetooth_adapter.cc
diff --git a/device/bluetooth/bluetooth_adapter.cc b/device/bluetooth/bluetooth_adapter.cc
index 86b3769a009a7e314ec79c8f77c97f3308dfb036..382928e264429d59a25a932508c8b19c03a73b7c 100644
--- a/device/bluetooth/bluetooth_adapter.cc
+++ b/device/bluetooth/bluetooth_adapter.cc
@@ -60,6 +60,12 @@ bool BluetoothAdapter::HasObserver(BluetoothAdapter::Observer* observer) {
   return observers_.HasObserver(observer);
 }
 
+std::unordered_map<BluetoothDevice*, BluetoothDevice::UUIDSet>
+BluetoothAdapter::RetrieveGattConnectedDevicesWithDiscoveryFilter(
+    const BluetoothDiscoveryFilter& discovery_filter) {
+  return std::unordered_map<BluetoothDevice*, BluetoothDevice::UUIDSet>();
+}
+
 void BluetoothAdapter::StartDiscoverySession(
     const DiscoverySessionCallback& callback,
     const ErrorCallback& error_callback) {