bluetooth: Make public BluetoothDevice::GetName method.

device/bluetooth/bluetooth_low_energy_win.h

 // Copyright 2014 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_BLUETOOTH_LOW_ENERGY_WIN_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_WIN_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
+#include "base/optional.h"
 #include "device/bluetooth/bluetooth_export.h"
 #include "device/bluetooth/bluetooth_low_energy_defs_win.h"
 
 namespace device {
 namespace win {
 
 // Represents a device registry property value
 class DEVICE_BLUETOOTH_EXPORT DeviceRegistryPropertyValue {
  public:
   // Creates a property value instance, where |property_type| is one of REG_xxx
@@ skipping 55 matching lines @@
   // Attribute handle uniquely identifies this service on the device.
   USHORT attribute_handle = 0;
 };
 
 struct DEVICE_BLUETOOTH_EXPORT BluetoothLowEnergyDeviceInfo {
   BluetoothLowEnergyDeviceInfo();
   ~BluetoothLowEnergyDeviceInfo();
 
   base::FilePath path;
   std::string id;
-  std::string friendly_name;
+  base::Optional<std::string> friendly_name;
   BLUETOOTH_ADDRESS address;
   bool visible;
   bool authenticated;
   bool connected;
 };
 
 bool DEVICE_BLUETOOTH_EXPORT
 ExtractBluetoothAddressFromDeviceInstanceIdForTesting(
     const std::string& instance_id,
     BLUETOOTH_ADDRESS* btha,
@@ skipping 94 matching lines @@
 
  protected:
   BluetoothLowEnergyWrapper();
   virtual ~BluetoothLowEnergyWrapper();
 };
 
 }  // namespace win
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_WIN_H_