base: Make TimeDurationFormat* report failures.

base/i18n/time_formatting.h

Index: base/i18n/time_formatting.h
diff --git a/base/i18n/time_formatting.h b/base/i18n/time_formatting.h
index f8d616f08445e0b72cda1cc8842064e4875fc7b2..f79473da0a129632b56181205c374f7ad9ffffcb 100644
--- a/base/i18n/time_formatting.h
+++ b/base/i18n/time_formatting.h
@@ -8,6 +8,7 @@
 #ifndef BASE_I18N_TIME_FORMATTING_H_
 #define BASE_I18N_TIME_FORMATTING_H_
 
+#include "base/compiler_specific.h"
 #include "base/i18n/base_i18n_export.h"
 #include "base/strings/string16.h"
 
@@ -76,28 +77,31 @@ BASE_I18N_EXPORT string16 TimeFormatFriendlyDateAndTime(const Time& time);
 BASE_I18N_EXPORT string16 TimeFormatFriendlyDate(const Time& time);
 
 // Formats a time duration of hours and minutes into various formats, e.g.,
-// "3:07" or "3 hours, 7 minutes".  See DurationFormatWidth for details.
+// "3:07" or "3 hours, 7 minutes", and returns true on success. See
+// DurationFormatWidth for details.
 //
 // Please don't use width = DURATION_WIDTH_NUMERIC when the time duration
 // can possibly be larger than 24h, as the hour value will be cut below 24
 // after formatting.
 // TODO(chengx): fix function output when width = DURATION_WIDTH_NUMERIC
 // (http://crbug.com/675791)
-BASE_I18N_EXPORT string16 TimeDurationFormat(const TimeDelta time,
-                                             const DurationFormatWidth width);
+BASE_I18N_EXPORT bool TimeDurationFormat(const TimeDelta time,
+                                         const DurationFormatWidth width,
+                                         string16* out) WARN_UNUSED_RESULT;
 
 // Formats a time duration of hours, minutes and seconds into various formats,
-// e.g., "3:07:30" or "3 hours, 7 minutes, 30 seconds". See DurationFormatWidth
-// for details.
+// e.g., "3:07:30" or "3 hours, 7 minutes, 30 seconds", and returns true on
+// success. See DurationFormatWidth for details.
 //
 // Please don't use width = DURATION_WIDTH_NUMERIC when the time duration
 // can possibly be larger than 24h, as the hour value will be cut below 24
 // after formatting.
 // TODO(chengx): fix function output when width = DURATION_WIDTH_NUMERIC
 // (http://crbug.com/675791)
-BASE_I18N_EXPORT string16
-TimeDurationFormatWithSeconds(const TimeDelta time,
-                              const DurationFormatWidth width);
+BASE_I18N_EXPORT bool TimeDurationFormatWithSeconds(
+    const TimeDelta time,
+    const DurationFormatWidth width,
+    string16* out) WARN_UNUSED_RESULT;
 
 // Gets the hour clock type of the current locale. e.g.
 // k12HourClock (en-US).