base: Make TimeDurationFormat* report failures.

ash/common/system/chromeos/power/battery_notification.cc

 // 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 "ash/common/system/chromeos/power/battery_notification.h"
 
 #include "ash/common/system/chromeos/power/power_status.h"
 #include "ash/common/system/system_notifier.h"
 #include "ash/resources/grit/ash_resources.h"
 #include "ash/strings/grit/ash_strings.h"
@@ skipping 44 matching lines @@
   const base::TimeDelta time = status.IsBatteryCharging()
                                    ? status.GetBatteryTimeToFull()
                                    : status.GetBatteryTimeToEmpty();
   base::string16 time_message;
   if (status.IsUsbChargerConnected()) {
     time_message = l10n_util::GetStringUTF16(
         IDS_ASH_STATUS_TRAY_BATTERY_CHARGING_UNRELIABLE);
   } else if (PowerStatus::ShouldDisplayBatteryTime(time) &&
              !status.IsBatteryDischargingOnLinePower()) {
     if (status.IsBatteryCharging()) {
+      base::string16 duration;
+      if (!TimeDurationFormat(time, base::DURATION_WIDTH_NARROW, &duration))
+        LOG(ERROR) << "Failed to format duration " << time.ToInternalValue();
       time_message = l10n_util::GetStringFUTF16(
-          IDS_ASH_STATUS_TRAY_BATTERY_TIME_UNTIL_FULL,
-          TimeDurationFormat(time, base::DURATION_WIDTH_NARROW));
+          IDS_ASH_STATUS_TRAY_BATTERY_TIME_UNTIL_FULL, duration);
     } else {
       // This is a low battery warning prompting the user in minutes.
       time_message = ui::TimeFormat::Simple(ui::TimeFormat::FORMAT_REMAINING,
                                             ui::TimeFormat::LENGTH_LONG, time);
     }
   }
 
   if (!time_message.empty())
     message = message + base::ASCIIToUTF16("\n") + time_message;
 
@@ skipping 24 matching lines @@
 
 void BatteryNotification::Update(
     TrayPower::NotificationState notification_state) {
   if (message_center_->FindVisibleNotificationById(kBatteryNotificationId)) {
     message_center_->UpdateNotification(kBatteryNotificationId,
                                         CreateNotification(notification_state));
   }
 }
 
 }  // namespace ash