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..72a2e0cbcca2c66212828d513678186425dd5430
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+++ b/ash/common/system/chromeos/network/sms_observer.h
@@ -0,0 +1,35 @@
+// 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 "chromeos/network/network_sms_handler.h"
+
+namespace base {
+class DictionaryValue;
+}
+
+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_ = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(SmsObserver);
+};
+
+}  // namespace ash
+
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_SMS_OBSERVER_H_