Send notification to users upon receiving sms messages

ash/common/system/chromeos/network/sms_observer.h

Index: ash/common/system/chromeos/network/sms_observer.h
diff --git a/ash/common/system/chromeos/network/sms_observer.h b/ash/common/system/chromeos/network/sms_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..f8069586d9ff51bef2f561b40c28a55beb04f801
--- /dev/null
+++ b/ash/common/system/chromeos/network/sms_observer.h
@@ -0,0 +1,37 @@
+// Copyright 2017 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_COMMON_SYSTEM_CHROMEOS_NETWORK_SMS_OBSERVER_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_SMS_OBSERVER_H_
+
+#include <stddef.h>
+
+#include <string>
+#include "ash/common/system/tray/system_tray_item.h"
+#include "base/macros.h"
+#include "base/values.h"
+#include "chromeos/network/network_sms_handler.h"
+
+namespace ash {
+
+// SmsObserver is called when a new sms message is received. Then it shows the
+// sms message to the user in the notification center.
+class SmsObserver : public chromeos::NetworkSmsHandler::Observer {
+ public:
+  SmsObserver();
+  ~SmsObserver() override;
+
+  // chromeos::NetworkSmsHandler::Observer:
+  void MessageReceived(const base::DictionaryValue& message) override;
+
+ private:
+  // Used to create notification identifier.
+  uint32_t message_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(SmsObserver);
+};
+
+}  // namespace ash
+
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_SMS_OBSERVER_H_