Add TraySms for SMS messages.

ash/system/network/tray_sms.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_NETWORK_TRAY_SMS_H
+#define ASH_SYSTEM_NETWORK_TRAY_SMS_H
+#pragma once
+
+#include "ash/system/tray/tray_image_item.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace ash {
+namespace internal {
+
+class TraySms : public TrayImageItem {
+ public:
+  TraySms();
+  virtual ~TraySms();
+
+  // Overridden from SystemTrayItem.
+  virtual views::View* CreateDefaultView(user::LoginStatus status) OVERRIDE;
+  virtual views::View* CreateDetailedView(user::LoginStatus status) OVERRIDE;
+  virtual views::View* CreateNotificationView(user::LoginStatus status)
+      OVERRIDE;

[sadrul, 2012/05/15 15:10:50]

OVERRIDE shouldn't be in its own line. You can move the parameter from the line
before (see tray_power)

[stevenjb, 2012/05/15 16:55:20]

Done.

+  virtual void DestroyDefaultView() OVERRIDE;
+  virtual void DestroyDetailedView() OVERRIDE;
+  virtual void DestroyNotificationView() OVERRIDE;
+
+  // Overridden from TrayImageItem.
+  virtual bool GetInitialVisibility() OVERRIDE;
+
+ protected:
+  class SmsDefaultView;

[sadrul, 2012/05/15 15:10:50]

This is OK. But I wanted to point out that the rest of the tray-related code has
these in a tray:: namespace.

[stevenjb, 2012/05/15 16:55:20]

That works fine too, but in this case most of these also need to be friends, so
this is more compact.

+  class SmsDetailedView;
+  class SmsMessageView;
+  class SmsNotificationView;
+  class SmsObserver;
+
+  // Called when sms messages have changed (by tray::SmsObserver).
+  void Update(bool notify);
+
+  SmsObserver* sms_observer() const { return sms_observer_.get(); }
+
+ private:
+  SmsDefaultView* default_;
+  SmsDetailedView* detailed_;
+  SmsNotificationView* notification_;
+  scoped_ptr<SmsObserver> sms_observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(TraySms);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_NETWORK_TRAY_SMS_H