ash: Fix regression where system tray clock wasn't updated.

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 f303f73a37c383c77e9f948ceead97c2edb9ebfb..97669f17b7c735c21700674b9dc13f51c70616aa 100644
--- a/ash/system/date/date_view.cc
+++ b/ash/system/date/date_view.cc
@@ -60,10 +60,16 @@ BaseDateTimeView::~BaseDateTimeView() {
 
 void BaseDateTimeView::UpdateText() {
   base::Time now = base::Time::Now();
-  gfx::Size old_size = GetPreferredSize();
   UpdateTextInternal(now);
   SchedulePaint();
+  SetTimer(now);
+}
+
+BaseDateTimeView::BaseDateTimeView() {
+  SetTimer(base::Time::Now());
+}
 
+void BaseDateTimeView::SetTimer(const base::Time& now) {
   // Try to set the timer to go off at the next change of the minute. We don't
   // want to have the timer go off more than necessary since that will cause
   // the CPU to wake up and consume power.
@@ -86,9 +92,6 @@ void BaseDateTimeView::UpdateText() {
       this, &BaseDateTimeView::UpdateText);
 }
 
-BaseDateTimeView::BaseDateTimeView() {
-}
-
 void BaseDateTimeView::ChildPreferredSizeChanged(views::View* child) {
   views::View::PreferredSizeChanged();
   if (GetWidget())