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

device/bluetooth/bluetooth_remote_gatt_characteristic_mac.mm

 // 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.
 
 #include "device/bluetooth/bluetooth_remote_gatt_characteristic_mac.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 240 matching lines @@
 
 void BluetoothRemoteGattCharacteristicMac::DidUpdateValue(NSError* error) {
   CHECK_EQ(GetCBPeripheral().state, CBPeripheralStateConnected);
   // This method is called when the characteristic is read and when a
   // notification is received.
   if (characteristic_value_read_or_write_in_progress_) {
     std::pair<ValueCallback, ErrorCallback> callbacks;
     callbacks.swap(read_characteristic_value_callbacks_);
     characteristic_value_read_or_write_in_progress_ = false;
     if (error) {
+      BluetoothGattService::GattErrorCode error_code =
+          BluetoothDeviceMac::GetGattErrorCodeFromNSError(error);
       VLOG(1) << *this
               << ": Bluetooth error while reading for characteristic, domain: "
-              << base::SysNSStringToUTF8(error.domain)
-              << ", error code: " << error.code;
-      BluetoothGattService::GattErrorCode error_code =
-          BluetoothDeviceMac::GetGattErrorCodeFromNSError(error);
+              << error << ", error code: " << error_code;
       callbacks.second.Run(error_code);
       return;
     }
     VLOG(1) << *this << ": Read request arrived.";
     UpdateValue();
     callbacks.first.Run(value_);
   } else if (IsNotifying()) {
     VLOG(1) << *this << ": Notification arrived.";
     UpdateValue();
     gatt_service_->GetMacAdapter()->NotifyGattCharacteristicValueChanged(
@@ skipping 20 matching lines @@
     // In case of buggy device, nothing should be done if receiving extra
     // write confirmation.
     VLOG(1) << *this
             << ": Write notification while no write operation pending.";
     return;
   }
   std::pair<base::Closure, ErrorCallback> callbacks;
   callbacks.swap(write_characteristic_value_callbacks_);
   characteristic_value_read_or_write_in_progress_ = false;
   if (error) {
-    VLOG(1) << *this
-            << ": Bluetooth error while writing for characteristic, domain: "
-            << base::SysNSStringToUTF8(error.domain)
-            << ", error code: " << error.code;
     BluetoothGattService::GattErrorCode error_code =
         BluetoothDeviceMac::GetGattErrorCodeFromNSError(error);
+    VLOG(1) << *this
+            << ": Bluetooth error while writing for characteristic, error: "
+            << error << ", error code: " << error_code;
     callbacks.second.Run(error_code);
     return;
   }
   VLOG(1) << *this << ": Write value succeeded.";
   callbacks.first.Run();
 }
 
 void BluetoothRemoteGattCharacteristicMac::DidUpdateNotificationState(
     NSError* error) {
   PendingNotifyCallbacks reentrant_safe_callbacks;
   if (!subscribe_to_notification_callbacks_.first.is_null()) {
     DCHECK([GetCBCharacteristic() isNotifying] || error);
     reentrant_safe_callbacks.swap(subscribe_to_notification_callbacks_);
   } else if (!unsubscribe_from_notification_callbacks_.first.is_null()) {
     DCHECK(![GetCBCharacteristic() isNotifying] || error);
     reentrant_safe_callbacks.swap(unsubscribe_from_notification_callbacks_);
   } else {
     VLOG(1) << *this << ": No pending notification update for characteristic.";
     return;
   }
   if (error) {
+    BluetoothGattService::GattErrorCode error_code =
+        BluetoothDeviceMac::GetGattErrorCodeFromNSError(error);
     VLOG(1) << *this
             << ": Bluetooth error while modifying notification state for "
-               "characteristic, domain: "
-            << base::SysNSStringToUTF8(error.domain)
-            << ", error code: " << error.code << ", localized description: "
-            << base::SysNSStringToUTF8(error.localizedDescription);
-    BluetoothGattService::GattErrorCode error_code =
-        BluetoothDeviceMac::GetGattErrorCodeFromNSError(error);
+               "characteristic, error: "
+            << error << ", error code: " << error_code;
     reentrant_safe_callbacks.second.Run(error_code);
     return;
   }
   reentrant_safe_callbacks.first.Run();
 }
 
 void BluetoothRemoteGattCharacteristicMac::DidDiscoverDescriptors() {
   DCHECK(!is_discovery_complete_);
   VLOG(1) << *this << ": Did discover descriptors.";
   std::unordered_set<std::string> descriptor_identifier_to_remove;
@@ skipping 96 matching lines @@
   const BluetoothRemoteGattServiceMac* service_mac =
       static_cast<const BluetoothRemoteGattServiceMac*>(
           characteristic.GetService());
   return out << "<BluetoothRemoteGattCharacteristicMac "
              << characteristic.GetUUID().canonical_value() << "/"
              << &characteristic
              << ", service: " << service_mac->GetUUID().canonical_value() << "/"
              << service_mac << ">";
 }
 }  // namespace device.