Bluetooth: macOS: Adding logs

device/bluetooth/bluetooth_remote_gatt_descriptor_mac.mm

 // Copyright 2017 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.
 
 #include "device/bluetooth/bluetooth_remote_gatt_descriptor_mac.h"
 
 #include "base/strings/sys_string_conversions.h"
 #include "device/bluetooth/bluetooth_adapter_mac.h"
 #include "device/bluetooth/bluetooth_remote_gatt_characteristic_mac.h"
 
@@ skipping 56 matching lines @@
     const std::vector<uint8_t>& new_value,
     const base::Closure& callback,
     const ErrorCallback& error_callback) {
   NOTIMPLEMENTED();
 }
 
 CBDescriptor* BluetoothRemoteGattDescriptorMac::GetCBDescriptor() const {
   return cb_descriptor_.get();
 }
 
+DEVICE_BLUETOOTH_EXPORT std::ostream& operator<<(
+    std::ostream& out,
+    const BluetoothRemoteGattDescriptorMac& descriptor) {
+  const BluetoothRemoteGattCharacteristicMac* characteristic_mac =
+      static_cast<const BluetoothRemoteGattCharacteristicMac*>(
+          descriptor.GetCharacteristic());
+  return out << "<BluetoothRemoteGattServiceMac "
+             << descriptor.GetUUID().canonical_value() << "/" << &descriptor
+             << ", characteristic: "
+             << characteristic_mac->GetUUID().canonical_value() << "/"
+             << characteristic_mac << ">";
+}
+
 }  // namespace device.