Bluetooth: macOS: Adding counter for service discovery callbacks.

device/bluetooth/test/bluetooth_test_mac.mm

Index: device/bluetooth/test/bluetooth_test_mac.mm
diff --git a/device/bluetooth/test/bluetooth_test_mac.mm b/device/bluetooth/test/bluetooth_test_mac.mm
index 41b5748f1050c3bbc12e3a893f0c0867a43b604a..30b33d330955319a2b72c39b2f556acdbfe00b9f 100644
--- a/device/bluetooth/test/bluetooth_test_mac.mm
+++ b/device/bluetooth/test/bluetooth_test_mac.mm
@@ -467,6 +467,7 @@ void BluetoothTestMac::SimulateGattCharacteristicRemoved(
   MockCBCharacteristic* characteristic_mock =
       ObjCCast<MockCBCharacteristic>(cb_characteristic);
   [service_mock removeCharacteristicMock:characteristic_mock];
+  [peripheral_mock didModifyServices:@[]];
   [peripheral_mock mockDidDiscoverEvents];
 }
 
@@ -499,6 +500,10 @@ void BluetoothTestMac::OnFakeBluetoothServiceDiscovery() {
   gatt_discovery_attempts_++;
 }
 
+void BluetoothTestMac::OnFakeBluetoothCharacteristicDiscovery() {
+  gatt_characteristic_discovery_attempts_++;
+}
+
 void BluetoothTest::OnFakeBluetoothCharacteristicReadValue() {
   gatt_read_characteristic_attempts_++;
 }