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

device/bluetooth/dbus/bluetooth_gatt_descriptor_delegate_wrapper.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_DBUS_BLUETOOTH_GATT_DESCRIPTOR_DELEGATE_WRAPPER_H_
 #define DEVICE_BLUETOOTH_DBUS_BLUETOOTH_GATT_DESCRIPTOR_DELEGATE_WRAPPER_H_
 
 #include <cstdint>
 #include <vector>
 
@@ skipping 11 matching lines @@
 // Wrapper class around AttributeValueDelegate to handle descriptors.
 class BluetoothGattDescriptorDelegateWrapper
     : public BluetoothGattAttributeValueDelegate {
  public:
   BluetoothGattDescriptorDelegateWrapper(
       BluetoothLocalGattServiceBlueZ* service,
       BluetoothLocalGattDescriptorBlueZ* descriptor);
 
   // BluetoothGattAttributeValueDelegate overrides:
   void GetValue(
+      const dbus::ObjectPath& device_path,
       const device::BluetoothLocalGattService::Delegate::ValueCallback&
           callback,
       const device::BluetoothLocalGattService::Delegate::ErrorCallback&
           error_callback) override;
   void SetValue(
+      const dbus::ObjectPath& device_path,
       const std::vector<uint8_t>& value,
       const base::Closure& callback,
       const device::BluetoothLocalGattService::Delegate::ErrorCallback&
           error_callback) override;
   void StartNotifications() override {}
   void StopNotifications() override {}
 
  private:
-  BluetoothLocalGattServiceBlueZ* service_;
   BluetoothLocalGattDescriptorBlueZ* descriptor_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothGattDescriptorDelegateWrapper);
 };
 
 }  // namespace bluez
 
 #endif  // DEVICE_BLUETOOTH_DBUS_BLUETOOTH_GATT_DESCRIPTOR_DELEGATE_WRAPPER_H_