diff --git a/daemon_state_interface.h b/daemon_state_interface.h
new file mode 100644
index 0000000..a0944aa
--- /dev/null
+++ b/daemon_state_interface.h
@@ -0,0 +1,45 @@
+//
+// 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_DAEMON_STATE_INTERFACE_H_
+#define UPDATE_ENGINE_DAEMON_STATE_INTERFACE_H_
+
+#include "update_engine/service_observer_interface.h"
+
+#include <memory>
+
+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;
+
+ protected:
+  DaemonStateInterface() = default;
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // UPDATE_ENGINE_DAEMON_STATE_INTERFACE_H_