Bluetooth: mac: Working on macOS descriptor implementation.

device/bluetooth/bluetooth_remote_gatt_service_mac.mm

Index: device/bluetooth/bluetooth_remote_gatt_service_mac.mm
diff --git a/device/bluetooth/bluetooth_remote_gatt_service_mac.mm b/device/bluetooth/bluetooth_remote_gatt_service_mac.mm
index ca8ac7e06ef7da5c5d4413b28f648e4b8f48f244..505321e6aa15a60eb11cd9cf1f988f6c3a5d2d3d 100644
--- a/device/bluetooth/bluetooth_remote_gatt_service_mac.mm
+++ b/device/bluetooth/bluetooth_remote_gatt_service_mac.mm
@@ -95,6 +95,7 @@ void BluetoothRemoteGattServiceMac::DidDiscoverCharacteristics() {
     if (gatt_characteristic_mac) {
       const std::string& identifier = gatt_characteristic_mac->GetIdentifier();
       characteristic_identifier_to_remove.erase(identifier);
+      gatt_characteristic_mac->DiscoverDescriptors();
       continue;
     }
     gatt_characteristic_mac =
@@ -103,6 +104,7 @@ void BluetoothRemoteGattServiceMac::DidDiscoverCharacteristics() {
     auto result_iter = gatt_characteristic_macs_.insert(
         {identifier, base::WrapUnique(gatt_characteristic_mac)});
     DCHECK(result_iter.second);
+    gatt_characteristic_mac->DiscoverDescriptors();
     GetMacAdapter()->NotifyGattCharacteristicAdded(gatt_characteristic_mac);
   }
 
@@ -118,6 +120,16 @@ void BluetoothRemoteGattServiceMac::DidDiscoverCharacteristics() {
   SendNotificationIfComplete();
 }
 
+void BluetoothRemoteGattServiceMac::DidDiscoverDescriptors(
+    CBCharacteristic* characteristic) {
+  DCHECK(!is_discovery_complete_);
+  BluetoothRemoteGattCharacteristicMac* gatt_characteristic =
+      GetBluetoothRemoteGattCharacteristicMac(characteristic);
+  DCHECK(gatt_characteristic);
+  gatt_characteristic->DidDiscoverDescriptors();
+  SendNotificationIfComplete();
+}
+
 void BluetoothRemoteGattServiceMac::SendNotificationIfComplete() {
   DCHECK(!is_discovery_complete_);
   // Notify when all characteristics have been fully discovered.