[MD History] Fix toolbar dates in grouped mode.

base/i18n/time_formatting.h

 // Copyright (c) 2011 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.
 
 // Basic time formatting methods.  These methods use the current locale
 // formatting for displaying the time.
 
 #ifndef BASE_I18N_TIME_FORMATTING_H_
 #define BASE_I18N_TIME_FORMATTING_H_
 
@@ skipping 44 matching lines @@
 
 // Returns a shortened date, e.g. "Nov 7, 2007"
 BASE_I18N_EXPORT string16 TimeFormatShortDate(const Time& time);
 
 // Returns a numeric date such as 12/13/52.
 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
 TimeFormatShortDateAndTimeWithTimeZone(const Time& time);
 
 // Formats a time in a friendly sentence format, e.g.
 // "Monday, March 6, 2008 2:44:30 PM".
 BASE_I18N_EXPORT string16 TimeFormatFriendlyDateAndTime(const Time& time);
 
 // Formats a time in a friendly sentence format, e.g.
 // "Monday, March 6, 2008".
 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.
 BASE_I18N_EXPORT string16 TimeDurationFormat(const TimeDelta& time,
                                              const DurationFormatWidth width);
 
 // Gets the hour clock type of the current locale. e.g.
 // k12HourClock (en-US).
 // k24HourClock (en-GB).
 BASE_I18N_EXPORT HourClockType GetHourClockType();
 
 }  // namespace base
 
 #endif  // BASE_I18N_TIME_FORMATTING_H_