bluetooth: mac: Initial BluetoothRemoteGattCharacteristicMac implementation

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 f725bba35df3a9f24414ae7c98f3af53d7acef39..a323131c18dcba10b1b17f33fc97059cc0731b38 100644
--- a/device/bluetooth/test/bluetooth_test_mac.h
+++ b/device/bluetooth/test/bluetooth_test_mac.h
@@ -10,6 +10,12 @@
 #include "base/test/test_simple_task_runner.h"
 #include "device/bluetooth/test/bluetooth_test.h"
 
+#if __OBJC__
+@class MockCBPeripheral;
+#else   // __OBJC__
+class MockCBPeripheral;
+#endif  // __OBJC__
+
 namespace device {
 
 class BluetoothAdapterMac;
@@ -41,6 +47,12 @@ class BluetoothTestMac : public BluetoothTestBase {
       BluetoothDevice* device,
       const std::vector<std::string>& uuids) override;
   void SimulateGattServiceRemoved(BluetoothRemoteGattService* service) override;
+  void SimulateGattCharacteristic(BluetoothRemoteGattService* service,
+                                  const std::string& uuid,
+                                  int properties) override;
+  void SimulateGattCharacteristicRemoved(
+      BluetoothRemoteGattService* service,
+      BluetoothRemoteGattCharacteristic* characteristic) override;
 
   // Callback for the bluetooth central manager mock.
   void OnFakeBluetoothDeviceConnectGattCalled();
@@ -52,6 +64,10 @@ class BluetoothTestMac : public BluetoothTestBase {
  protected:
   class ScopedMockCentralManager;
 
+  // Returns MockCBPeripheral from BluetoothRemoteGattService.
+  MockCBPeripheral* GetMockCBPeripheral(
+      BluetoothRemoteGattService* service) const;
+
   // Utility function for finding CBUUIDs with relatively nice SHA256 hashes.
   std::string FindCBUUIDForHashTarget();