Added a cmd for configuring number of video buffers for camera, if supported

     * can silently finish itself or show a dialog.

     */

    CAMERA_CMD_PING = 9,

    /**

     * Configure the number of video buffers used for recording. The intended

     * video buffer count for recording is passed as arg1, which must be

     * greater than 0. This command must be sent before recording is started.

     * This command returns INVALID_OPERATION error if it is sent after video

     * recording is started, or the command is not supported at all. This

     * command also returns a BAD_VALUE error if the intended video buffer

     * count is non-positive or too big to be realized.

     */

    CAMERA_CMD_SET_VIDEO_BUFFER_COUNT = 10,

};

/** camera fatal errors */