Bluetooth: macOS: DidModifyServices can happens while scanning

device/bluetooth/test/bluetooth_test_mac.h

Index: device/bluetooth/test/bluetooth_test_mac.h
diff --git a/device/bluetooth/test/bluetooth_test_mac.h b/device/bluetooth/test/bluetooth_test_mac.h
index 46e168a4d7c103432301130a05f5c1e113bd6085..a45ff64c9830ffbb8cf1ddf52794813802ab8292 100644
--- a/device/bluetooth/test/bluetooth_test_mac.h
+++ b/device/bluetooth/test/bluetooth_test_mac.h
@@ -91,8 +91,24 @@ class BluetoothTestMac : public BluetoothTestBase {
   // macOS is the only platform for which we need to discover each set of
   // attributes individually so we need a method to simulate discovering each
   // set of attributes.
-  void SimulateDidDiscoverServices(BluetoothDevice* device,
-                                   const std::vector<std::string>& uuids);
+  // Simulates service discovery for a device.
+  void SimulateDidDiscoverServices(BluetoothDevice* device);
+  // Simulates characteristic discovery for a service.
+  void SimulateDidDiscoverCharacteristics(BluetoothRemoteGattService* service);
+  // Simulates descriptor discovery for a characteristic.
+  void SimulateDidDiscoverDescriptors(
+      BluetoothRemoteGattCharacteristic* characteristic);
+  // Adds services in MockCBPeripheral.
+  void AddServicesToDevice(BluetoothDevice* device,
+                           const std::vector<std::string>& uuids);
+  // Adds a characteristic in MockCBService.
+  void AddCharacteristicToService(BluetoothRemoteGattService* service,
+                                  const std::string& characteristic_uuid,
+                                  int properties);
+  // Adds a descriptor in MockCBCharacteristic.
+  void AddDescriptorToCharacteristic(
+      BluetoothRemoteGattCharacteristic* characteristic,
+      const std::string& uuid);
 
   // Callback for the bluetooth central manager mock.
   void OnFakeBluetoothDeviceConnectGattCalled();
@@ -124,9 +140,6 @@ class BluetoothTestMac : public BluetoothTestBase {
   // Returns MockCBCharacteristic from BluetoothRemoteGattCharacteristic.
   MockCBCharacteristic* GetCBMockCharacteristic(
       BluetoothRemoteGattCharacteristic* characteristic) const;
-  // Adds services in MockCBPeripheral.
-  void AddServicesToDevice(BluetoothDevice* device,
-                           const std::vector<std::string>& uuids);
 
   // Utility function for finding CBUUIDs with relatively nice SHA256 hashes.
   std::string FindCBUUIDForHashTarget();