bluetooth: mac: Initial BluetoothRemoteGattCharacteristicMac implementation

device/bluetooth/test/mock_bluetooth_cbservice_mac.h

Index: device/bluetooth/test/mock_bluetooth_cbservice_mac.h
diff --git a/device/bluetooth/test/mock_bluetooth_cbservice_mac.h b/device/bluetooth/test/mock_bluetooth_cbservice_mac.h
index 553370649f751d3a03c222038def7f1a09e3f745..fd0867dd810fa79bbdbb3494ff6b9bba15bdc6c0 100644
--- a/device/bluetooth/test/mock_bluetooth_cbservice_mac.h
+++ b/device/bluetooth/test/mock_bluetooth_cbservice_mac.h
@@ -10,6 +10,8 @@
 
 #import <CoreBluetooth/CoreBluetooth.h>
 
+@class MockCBCharacteristic;
+
 // This class mocks the behavior of a CBService.
 @interface MockCBService : NSObject
 
@@ -17,7 +19,13 @@
 @property(readonly, nonatomic) BOOL isPrimary;
 @property(readonly, nonatomic) CBService* service;
 
-- (instancetype)initWithCBUUID:(CBUUID*)uuid primary:(BOOL)isPrimary;
+- (instancetype)initWithPeripheral:(CBPeripheral*)peripheral
+                            CBUUID:(CBUUID*)uuid
+                           primary:(BOOL)isPrimary;
+
+// Creates and adds a mock characteristic.
+- (void)addCharacteristicWithUUID:(CBUUID*)cb_uuid properties:(int)properties;
+- (void)removeCharacteristicMock:(MockCBCharacteristic*)characteristic_mock;
 
 @end