[MD History] Fix toolbar dates in grouped mode.

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 761dd98a5d427e8441b7b17405be2dcb39933a6b..7f0103e51628566f76282b3a656fb6986dfd47ef 100644
--- a/base/i18n/time_formatting.h
+++ b/base/i18n/time_formatting.h
@@ -62,6 +62,12 @@ BASE_I18N_EXPORT string16 TimeFormatShortDateNumeric(const Time& time);
 // Returns a numeric date and time such as "12/13/52 2:44:30 PM".
 BASE_I18N_EXPORT string16 TimeFormatShortDateAndTime(const Time& time);
 
+// Returns a month and year, e.g. "November 2007"
+BASE_I18N_EXPORT string16 TimeFormatMonthAndYear(const Time& time);
+
+// Returns a weekday, month and day, e.g. "Tuesday, 7 November"
+BASE_I18N_EXPORT string16 TimeFormatWeekdayMonthAndDay(const Time& time);
+
 // Returns a numeric date and time with time zone such as
 // "12/13/52 2:44:30 PM PST".
 BASE_I18N_EXPORT string16