Adding std::ostream& operator<<(std::ostream& out, NSError* error)

device/bluetooth/bluetooth_low_energy_device_mac.mm

 // Copyright 2015 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_low_energy_device_mac.h"
 
 #import <CoreFoundation/CoreFoundation.h>
 #include <stddef.h>
 
 #include "base/mac/mac_util.h"
@@ skipping 183 matching lines @@
     VLOG(1) << *this
             << ": BluetoothLowEnergyDeviceMac::discovery_pending_count_ "
             << discovery_pending_count_;
     discovery_pending_count_ = 0;
     return;
   }
   if (error) {
     // TODO(http://crbug.com/609320): Need to pass the error.
     // TODO(http://crbug.com/609844): Decide what to do if discover failed
     // a device services.
-    VLOG(1) << *this << ": Can't discover primary services: "
-            << error.localizedDescription.UTF8String << " (" << error.domain
-            << ": " << error.code << ").";
+    VLOG(1) << *this << ": Can't discover primary services: " << error;
     return;
   }
 
   if (!IsGattConnected()) {
     // Don't create services if the device disconnected.
     VLOG(1) << *this << ": DidDiscoverPrimaryServices, gatt not connected.";
     return;
   }
   VLOG(1) << *this << ": DidDiscoverPrimaryServices, pending count: "
           << discovery_pending_count_;
@@ skipping 23 matching lines @@
     SendNotificationIfDiscoveryComplete();
   }
 }
 
 void BluetoothLowEnergyDeviceMac::DidDiscoverCharacteristics(
     CBService* cb_service,
     NSError* error) {
   if (error) {
     // TODO(http://crbug.com/609320): Need to pass the error.
     // TODO(http://crbug.com/609844): Decide what to do if discover failed
-    VLOG(1) << *this << ": Can't discover characteristics: "
-            << error.localizedDescription.UTF8String << " (" << error.domain
-            << ": " << error.code << ").";
+    VLOG(1) << *this << ": Can't discover characteristics: " << error;
     return;
   }
 
   if (!IsGattConnected()) {
     VLOG(1) << *this << ": DidDiscoverCharacteristics, gatt disconnected.";
     // Don't create characteristics if the device disconnected.
     return;
   }
 
   BluetoothRemoteGattServiceMac* gatt_service =
@@ skipping 50 matching lines @@
   DCHECK(gatt_service);
   gatt_service->DidUpdateNotificationState(characteristic, error);
 }
 
 void BluetoothLowEnergyDeviceMac::DidDiscoverDescriptors(
     CBCharacteristic* cb_characteristic,
     NSError* error) {
   if (error) {
     // TODO(http://crbug.com/609320): Need to pass the error.
     // TODO(http://crbug.com/609844): Decide what to do if discover failed
-    VLOG(1) << *this << ": Can't discover descriptors: "
-            << error.localizedDescription.UTF8String << " (" << error.domain
-            << ": " << error.code << ").";
+    VLOG(1) << *this << ": Can't discover descriptors: " << error;
     return;
   }
   if (!IsGattConnected()) {
     VLOG(1) << *this << ": DidDiscoverDescriptors, disconnected.";
     // Don't discover descriptors if the device disconnected.
     return;
   }
   BluetoothRemoteGattServiceMac* gatt_service =
       GetBluetoothRemoteGattService(cb_characteristic.service);
   DCHECK(gatt_service);
@@ skipping 65 matching lines @@
         static_cast<BluetoothRemoteGattServiceMac*>(gatt_service);
     if (gatt_service_mac->GetService() == cb_service)
       return gatt_service_mac;
   }
   return nullptr;
 }
 
 void BluetoothLowEnergyDeviceMac::DidDisconnectPeripheral(NSError* error) {
   VLOG(1) << *this << ": Disconnected from peripheral.";
   if (error) {
-    VLOG(1) << *this << ": Bluetooth error, domain: " << error.domain.UTF8String
-            << ", error code: " << error.code;
+    VLOG(1) << *this << ": Bluetooth error: " << error;
   }
   SetGattServicesDiscoveryComplete(false);
   // Removing all services at once to ensure that calling GetGattService on
   // removed service in GattServiceRemoved returns null.
   GattServiceMap gatt_services_swapped;
   gatt_services_swapped.swap(gatt_services_);
   gatt_services_swapped.clear();
   device_uuids_.ClearServiceUUIDs();
   // There are two cases in which this function will be called:
   //   1. When the connection to the device breaks (either because
@@ skipping 14 matching lines @@
 std::ostream& operator<<(std::ostream& out,
                          const BluetoothLowEnergyDeviceMac& device) {
   // TODO(crbug.com/703878): Should use
   // BluetoothLowEnergyDeviceMac::GetNameForDisplay() instead.
   base::Optional<std::string> name = device.GetName();
   const char* name_cstr = name ? name->c_str() : "";
   return out << "<BluetoothLowEnergyDeviceMac " << device.GetAddress() << "/"
              << &device << ", \"" << name_cstr << "\">";
 }
 }  // namespace device