Add DBus plumbing and tests for sending devices with ATT read/writes.

device/bluetooth/test/test_bluetooth_local_gatt_service_delegate.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DEVICE_BLUETOOTH_TEST_TEST_BLUETOOTH_LOCAL_GATT_SERVICE_DELEGATE_H_
 #define DEVICE_BLUETOOTH_TEST_TEST_BLUETOOTH_LOCAL_GATT_SERVICE_DELEGATE_H_
 
 #include <cstdint>
 #include <vector>
 
@@ skipping 56 matching lines @@
     expected_characteristic_ = characteristic;
   }
 
   void set_expected_descriptor(BluetoothLocalGattDescriptor* descriptor) {
     expected_descriptor_ = descriptor;
   }
 
   bool should_fail_;
   uint64_t last_written_value_;
   uint64_t value_to_write_;
+  std::string last_seen_device_;
 
  private:
   BluetoothLocalGattService* expected_service_;
   BluetoothLocalGattCharacteristic* expected_characteristic_;
   BluetoothLocalGattDescriptor* expected_descriptor_;
 
   std::map<std::string, bool> notifications_started_for_characteristic_;
 
   DISALLOW_COPY_AND_ASSIGN(TestBluetoothLocalGattServiceDelegate);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_TEST_TEST_BLUETOOTH_LOCAL_GATT_SERVICE_DELEGATE_H_