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diff --git a/common/daemon_state_interface.h b/common/daemon_state_interface.h
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+//
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef UPDATE_ENGINE_COMMON_DAEMON_STATE_INTERFACE_H_
+#define UPDATE_ENGINE_COMMON_DAEMON_STATE_INTERFACE_H_
+
+#include "update_engine/common/service_observer_interface.h"
+
+#include <set>
+
+namespace chromeos_update_engine {
+
+class DaemonStateInterface {
+ public:
+  virtual ~DaemonStateInterface() = default;
+
+  // Start the daemon loop. Should be called only once to start the daemon's
+  // main functionality.
+  virtual bool StartUpdater() = 0;
+
+  // Add and remove an observer. All the registered observers will be called
+  // whenever there's a new status to update.
+  virtual void AddObserver(ServiceObserverInterface* observer) = 0;
+  virtual void RemoveObserver(ServiceObserverInterface* observer) = 0;
+
+  // Return the set of current observers.
+  virtual const std::set<ServiceObserverInterface*>& service_observers() = 0;
+
+ protected:
+  DaemonStateInterface() = default;
+
+  DISALLOW_COPY_AND_ASSIGN(DaemonStateInterface);
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // UPDATE_ENGINE_COMMON_DAEMON_STATE_INTERFACE_H_