Add accessibility support for reading date and time on ash tray.

ash/system/date/date_view.cc

Index: ash/system/date/date_view.cc
diff --git a/ash/system/date/date_view.cc b/ash/system/date/date_view.cc
index e59b42ed2aa737071563780ed85e8b02a9dd0337..fd7fad0c84682707f433923bd909b8e985c7afb2 100644
--- a/ash/system/date/date_view.cc
+++ b/ash/system/date/date_view.cc
@@ -136,6 +136,11 @@ void DateView::SetActionable(bool actionable) {
 }
 
 void DateView::UpdateTextInternal(const base::Time& now) {
+  SetAccessibleName(
+      base::TimeFormatFriendlyDate(now) +
+      ASCIIToUTF16(",") +
+      base::TimeFormatTimeOfDayWithHourClockType(
+          now, base::k12HourClock, base:: kKeepAmPm));

[Jun Mukai, 2013/02/12 01:04:03]

Is there some reason to be comma-separated rather than IDS_ASH_STATUS_TRAY_DATE?
Sometimes people want to hear in their native language?
# I don't know which is better actually, probably good to ask dmazzoni

[jennyz, 2013/02/12 01:07:38]

IDS_ASH_STATUS_TRAY_DATE has the week in short format, like "Mon", "Fri", our
a11y system does not read it correctly. So I would like to use a longer format.
I add a "," in between date and time, so that the a11y will has a little pause.
Otherwise, it reads like "Friday, Feburary 11, 20014:00 pm".

[Jun Mukai, 2013/02/12 01:15:05]

ah, that makes sense. thanks!

   date_label_->SetText(
       l10n_util::GetStringFUTF16(
           IDS_ASH_STATUS_TRAY_DATE, FormatDayOfWeek(now), FormatDate(now)));