Media indicator for background recording task

ash/system/tray/media_security/media_capture_observer.h

+// Copyright 2014 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_CHROMEOS_MEDIA_SECURITY_MEDIA_CAPTURE_OBSERVER_H_
+#define ASH_SYSTEM_CHROMEOS_MEDIA_SECURITY_MEDIA_CAPTURE_OBSERVER_H_
+
+#include "ash/ash_export.h"
+
+namespace ash {
+
+class ASH_EXPORT MediaCaptureObserver {
+ public:
+  // Called when media capture state has changed.
+  virtual void OnMediaCaptureChanged() = 0;
+
+ protected:
+  virtual ~MediaCaptureObserver() {}
+};
+
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_CHROMEOS_MEDIA_SECURITY_MEDIA_CAPTURE_OBSERVER_H_