[MD History] Fix toolbar dates in grouped mode.

base/i18n/time_formatting.cc

Index: base/i18n/time_formatting.cc
diff --git a/base/i18n/time_formatting.cc b/base/i18n/time_formatting.cc
index 024b86510b5a8260565dbd02eaaa376949de22a3..7e84dcc28bfc3fa4575a82fe34d42a8b2560edfd 100644
--- a/base/i18n/time_formatting.cc
+++ b/base/i18n/time_formatting.cc
@@ -141,6 +141,17 @@ string16 TimeFormatShortDateAndTimeWithTimeZone(const Time& time) {
   return TimeFormat(formatter.get(), time);
 }
 
+string16 TimeFormatMonthAndYear(const Time& time) {
+  icu::SimpleDateFormat formatter = CreateSimpleDateFormatter(UDAT_YEAR_MONTH);
+  return TimeFormat(&formatter, time);
+}
+
+string16 TimeFormatWeekdayMonthAndDay(const Time& time) {
+  icu::SimpleDateFormat formatter =
+      CreateSimpleDateFormatter(UDAT_MONTH_WEEKDAY_DAY);
+  return TimeFormat(&formatter, time);
+}
+
 string16 TimeFormatFriendlyDateAndTime(const Time& time) {
   std::unique_ptr<icu::DateFormat> formatter(
       icu::DateFormat::createDateTimeInstance(icu::DateFormat::kFull));