update battery stats for audio/video

    // be kept in sync with frameworks/native/include/binder/IBatteryStats.h

    void noteStartSensor(int uid, int sensor);

    void noteStopSensor(int uid, int sensor);

    void noteStartVideo(int uid);

    void noteStopVideo(int uid);

    void noteStartAudio(int uid);

    void noteStopAudio(int uid);

    // Remaining methods are only used in Java.

    byte[] getStatistics();