Bluetooth: mac: Working on macOS descriptor implementation.

device/bluetooth/test/mock_bluetooth_cbperipheral_mac.h

Index: device/bluetooth/test/mock_bluetooth_cbperipheral_mac.h
diff --git a/device/bluetooth/test/mock_bluetooth_cbperipheral_mac.h b/device/bluetooth/test/mock_bluetooth_cbperipheral_mac.h
index 35ed7050302dd10cc118ed2db19b0c4b7a0db8e4..68aad269a4311f1fde776e04007acd0bf27c4b1e 100644
--- a/device/bluetooth/test/mock_bluetooth_cbperipheral_mac.h
+++ b/device/bluetooth/test/mock_bluetooth_cbperipheral_mac.h
@@ -15,6 +15,8 @@ namespace device {
 class BluetoothTestMac;
 }
 
+@class MockCBCharacteristic;
+
 // This class mocks the behavior of a CBPeripheral.
 @interface MockCBPeripheral : NSObject
 
@@ -39,8 +41,10 @@ class BluetoothTestMac;
 - (void)addServices:(NSArray*)services;
 - (void)didDiscoverServicesWithError:(NSError*)error;
 - (void)removeService:(CBService*)uuid;
-- (void)didModifyServices:(NSArray*)invalidatedServices;
 - (void)mockDidDiscoverEvents;
+- (void)didModifyServices:(NSArray*)invalidatedServices;
+- (void)didDiscoverDescriptorsWithCharacteristic:
+    (MockCBCharacteristic*)characteristic_mock;
 
 @end