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

ash/system/date/date_view.h

 // Copyright (c) 2012 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.
 
 #ifndef ASH_SYSTEM_DATE_DATE_VIEW_H_
 #define ASH_SYSTEM_DATE_DATE_VIEW_H_
 #pragma once
 
 #include "ash/system/tray/tray_views.h"
 #include "base/i18n/time_formatting.h"
 #include "base/timer.h"
 #include "ui/views/view.h"
 
 namespace views {
 class Label;
 }
 
 namespace ash {
 namespace internal {
 namespace tray {
 
 // Abstract base class containing common updating and layout code for the
 // DateView popup and the TimeView tray icon.
 class BaseDateTimeView : public ActionableView {
  public:
   virtual ~BaseDateTimeView();
 
-  // Updates the displayed text for the current time.
+  // Updates the displayed text for the current time and calls SetTimer().
   void UpdateText();
 
  protected:
   BaseDateTimeView();
 
  private:
+  // Starts |timer_| to schedule the next update.
+  void SetTimer(const base::Time& now);
+
   // Updates labels to display the current time.
   virtual void UpdateTextInternal(const base::Time& now) = 0;
 
   // Overridden from views::View.
   virtual void ChildPreferredSizeChanged(views::View* child) OVERRIDE;
   virtual void OnLocaleChanged() OVERRIDE;
 
+  // Invokes UpdateText() when the displayed time should change.
   base::OneShotTimer<BaseDateTimeView> timer_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseDateTimeView);
 };
 
 // Popup view used to display the date and day of week.
 class DateView : public BaseDateTimeView {
  public:
   DateView();
   virtual ~DateView();
@@ skipping 41 matching lines @@
   base::HourClockType hour_type_;
 
   DISALLOW_COPY_AND_ASSIGN(TimeView);
 };
 
 }  // namespace tray
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_DATE_DATE_VIEW_H_