[Athena] Add status icons and system time to the desktop background

athena/system/time_view.h

Index: athena/system/time_view.h
diff --git a/athena/system/time_view.h b/athena/system/time_view.h
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+// Copyright 2014 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 ATHENA_SYSTEM_TIME_VIEW_H_
+#define ATHENA_SYSTEM_TIME_VIEW_H_
+
+#include "athena/system/public/system_ui.h"
+#include "base/time/time.h"
+#include "base/timer/timer.h"
+#include "ui/views/controls/label.h"
+
+namespace athena {
+
+// View which displays the current time.
+class TimeView : public views::Label {
+ public:
+  TimeView();
+  virtual ~TimeView();
+
+ private:
+  // Starts |timer_| to schedule the next update.
+  void SetTimer(base::Time now);
+
+  // Updates the current time.
+  void UpdateText();
+
+  base::OneShotTimer<TimeView> timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(TimeView);
+};
+
+}  // namespace athena
+
+#endif  // ATHENA_SYSTEM_TIME_VIEW_H_