Add TraySms for SMS messages.

ash/system/network/tray_sms.h

Index: ash/system/network/tray_sms.h
diff --git a/ash/system/network/tray_sms.h b/ash/system/network/tray_sms.h
new file mode 100644
index 0000000000000000000000000000000000000000..fcdd99352e4b553990fc3d2fe6d2e627f8c30762
--- /dev/null
+++ b/ash/system/network/tray_sms.h
@@ -0,0 +1,56 @@
+// 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;
+  virtual void DestroyDefaultView() OVERRIDE;
+  virtual void DestroyDetailedView() OVERRIDE;
+  virtual void DestroyNotificationView() OVERRIDE;
+
+  // Overridden from TrayImageItem.
+  virtual bool GetInitialVisibility() OVERRIDE;
+
+ protected:
+  class SmsDefaultView;
+  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